Well excuse the language but we just got fucked. GW replied. And I quote.
"This is indeed a question that a number of folks have asked.
We have an answer from the studio about this; Warscroll Battalions that use titles of compendium models which no longer have a warscroll may no longer be used in matched play.
For example, if a warscroll battalion says it contains Minotaurs, it may no longer be used because Minotaurs are not in use any more; now they are Bullgors.
Hope that helps - Nick"
To this I have replied as folmows
"I prefer one of the previous two answers lol, shame the scroll couldn't just be updated with one of the two possible options or just have the option removed. Seems like an odd ruling too since the points value for it was given at the same time as the compendium was created. Also odd because Scar-Veteran on Foot has never existed in Age of Sigmar even in the compendium, seems like they made a mistake when creating the battalion and should have updated the battalion to read Astrolith Bearer since that is the incarnation of Scar-Veteran on Foot that was brought forwards in the Lizardmen rules before the Seraphon book was created and before the Compendium section existed."
Because I'm sorry it seems like they made a mistake and are too lazy to fix things. This actually annoys me.