Every single post I can find on the old forums made in the WoD era about clipping issues, are talking about the new models. This is the only post I could find that shows you claiming to have posted proof: https://us.battle.net/forums/en/wow/topic/20769728236?page=8#post-142
Doesn’t show me acknowledging anything, nor does it show any proof of the old model toggle not functioning properly. All I can find is you claiming that “every attempt to repair the old models and animations damaged them further.”