No worries

, I do not have a problem with harsh as long as it is civilized.
Cracks knuckles.
I applaud your basic concept that is "Since 8th edition is no longer officially supported, we have great freedom to personalize it!"
I disagree with almost every individual change you made. As much as I hate to give the current edition of Age of Sigmar credit, one thing they got right is that they regularly update the points value of units without changing the rules.
In my opinion, if you want to fix an over powered unit, or an underpowered unit, don't change the rules. Change the points value. Troglodons are pretty lousy with the RAW but if they were 150 points each, they would probably be pretty good.
Adding new units I applaud. As my main (realistically only) 8th hammer opponent says, for new units, "If you make a model for your unit, I'll let you play it. I am glacially slow on finishing models, but my plan is to use left over bits from Stegadon to make stationary giant bows using the stats for O&G bolt throwers but making them a bit more expensive points wise because they have poison and lack a misfire result.
8th edition, one thing that kind of bugged me was that Skinks were on the whole a more efficient means of paying the "Core Tax" than Saurus Warriors. Adding a point of Ld to all the Skinks shifts this more. True you gave Saurus more WS but since panic tests is the main weakness of Skinks, I think the balance is still pro-Skink.
Also, why not add Skink archers to the list. Tons of us have the models on hand...
I guess on the whole I'm okay boosting the stats of Saurus but I'd rather make them 10 points a model or 10.5 points a model.
You eliminated one of the main distinctions between Temple Guard and Saurus Warriors by giving the Saurus Warriors equivalent WS, then you raised the price of Temple Guard. I disagree with this strenuously. If I were making major changes to the codex, I'd like to see Slann-less Temple Guard be viable, now it's worse than ever cause you are paying for a power you wouldn't use.
The special rule that any Temple Guard can take a challenge for the Slann makes sense fluff wise but I think it remove a fundamental aspect of 8th edition by nullifying the challenge. Also, the penalty for a Slann refusing a challenge was pretty mild because the Slann is in the second row. If it's not broke, don't fix it.
I like your changes to Cold One Riders. I'm not disagreeing with
everything you wrote.
I am not a fan of Kroxigor costing 60 points in a Skink Cohort, 65 points as standalone unit. It should be the same. I think 60 points is a fair price given the upgrades you made, but I'd rather keep them as they were at 50 point. Maybe I want quantity over quality because I have an absurd number of Kroxigor models, so I'll admit I'm biased.
I certainly like the idea of adding Kroxigor command crews. Given my plethora of Kroxigor models I have been toying with the idea of converting a Kroxigor standard bearer myself. Wasn't sure about a musician but I thought it might be fun to put a singing Skink on his shoulders.
You changed almost every unit but left Jungle Swarms untouched? Jungle Swarms are our weakest unit. They need love more than anyone save maybe the Kroxigor.
I am not super stoked about raising Ld of Skinks across the board, but I do think Terradon and Ripperdactyl riders should be Ld 6. They are the bravest and craziest of the Skinks after all.
The 5 point break on Devestating Charge is so small, why even bother. The more minor changes you make, the more your 8.1 edition confuses people. As for the extra wound, I personally would rather keep the Stegadons as is and not boost the points cost.
If I could change one rule (other than points changes) with the 8th edition units and only one rule, I would enshrine my official interpretation of Predatory Fighter supporting attacks as canon. If I could change two rules, I would give Bastiladons stubborn. You changed A LOT of things about the Bastlidon but did not make them stubborn.
The rules changes you made for Bastiladons makes sense fluff wise but would bog down game play. This attack is WS 4 but
that attack is WS 2. This attack is S4 but that one is S5. I favor simplicity most of the time.
Going back to the omission of leaving Swarms untouched. The Ark of Sotek is so underpowered compared to the Solar Engine almost no one uses it. I think the Ark of Sotek should either become more powerful or it should become the cheaper option, pointwise.
With the Ancient Stegadon, again like with the regular Stegadon I'd just assume leave them as is statswise and keep the points cost the same.
EOTG can now also affect High magic, I agree, also add Undeath as an option (and add it to Wandering Deliberations too!).
Making the EOTG cost 40 points, I am with you 100% on.
If you don't up the leadership of Salamanders, you can drop the price back to what it used to be. Again, I think only the Skink sky cavalry needs a Ld upgrade.
Razordons are slightly cheaper, makes sense. I agree with this one.
I would rather change the points cost than change the rules for the Trogldons. That being said, the rules changes you propose for the Troglodon are well thought out, easy to play, and fair.
Your feral dinosaurs are a solid concept, though I would drop Rumble as a special rule. In 8th edition, Ld docking effects are rare and and nearly always overtly supernatural.
I think your tweaks to Skink Chiefs, are solid, no complaints.
I see little reason to alter the BS of Skink Priests because they don't carry missile weapons. The Intiative boost would just be inconvenient because you couldn't roll the Skink priest attack with the other Skinks he is with. That just is going to slow down combat slightly.
I really like the idea of Skink oracles as a character option, but why not just make them a wizard instead of the weird psuedo wizard. "They generate power dice and dispel dice as a wizard and have wizard spells but they cast their spells as a bound spell" Just say "level one wizard, lore of ____"
If mounted on a Troglodon, do not use the wound or WS characteristics of the Oracle, when attacked by an enemy unit. Instead all damage goes to the Troglodon and when the Troglodon dies the Oracle dies with it.
That blurs the line between characters with mounts and units taken as a monster. I see little reason to make this character unique among all characters. Simplicity is best.
I would drop Immune to Psychology on the Kroxigor Alpha and maybe add a wound. Otherwise, I am psyched about the idea of a Kroxigor hero of some kind. I'm not sure if it's necessary to bar said Kroxigor from being an army general though.
I like the idea of boosting the Ld of the Saurus Oldblood, not a big fan of the other tweaks on the Old Blood though.
As for the Slann.
May take magic items up to a total of 150 points (in total, so any banner counts towards this).
That is so similar to what exists already, why change this at all.
I would add the Lore of Undeath to Wandering Deliberations. I can't get enough of that Necromancy!
I disagree with giving a casting bonus to High Magic. Slann with High Magic are already very powerful, why
-25 PPM. Lizardmen players would agree to this, but mo one who plays Lizardmen regularly will agree to making our best unit cheaper.
I'm not going into the weeds of Special Characters. There is a lot open to individual interpretation and preference for SCs, so I'm not going to get on my high horse on this one.
I really like your magical item additions and tweaks, though if you are going to make Cube of Darkness work 6/6 as a dispel scroll instead of 5/6 times, I would up it by 5 points.
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Generally speaking, the BRB lores are stronger than Army book lores. In that way, the Lore of Sotek is solid because I think it pales before the other lores. I don't think I'd ever
choose the Lore of Sotek. Also we Lizardmen have more magical options than every other army. We don't really need an
eleventh lore.
We can show our religious pride without a lore about it. That's a crutch for the infidel Chaos worshipers and Orcs and Goblins.
Anyway I was pondering my own version of 8.1 edition and basically I only changed the points values though I changed the following.
-Predatory Fighter bonuses unambiguously to units in the supporting rank.
-Wandering Deliberations and the EOTG bonus can apply to the Lore of Undeath, if Lore of Undeath is agreed to be included as an option.
-We can add new units as long as we make a model or conversion for said new unit.
My main ideas for new units that I'm actually planning to do (eventually) are Skink Horned One Riders, Skink priests and chiefs riding Horned One, Skink Priests riding Terradons, Skink archers (already done, thank you 5th ed models!), and stationary giant bows. I would add Quatlixa (Saurus ghouls) as a unit for my Lustrian themed Undead Legions.
I also have a scheme to make a few Huagderon modes by adding green stuff to the skeletal dogs that came with Kings of War skeletons but the Huagerdons are going to be purely decorative, since Huagerdons cannot really fight.
Feasible ideas I'd like to do but realistically will never get around to doing include Lurkerdons, Saurus Warriors with two hand weapons, Skink crossbowmen (I have fluff to justify this), and Saurus Warriors with light armor, and a zombified Carnosaur for my Undead Legions.