This sort of obviously emotionaly driven vitriol makes it look like you want people to belive this regardless of if it truth as you feel it serves an important goal. The other person on the debate has shown an understanding of the issue and history of this topic while remaining civil, I don't see you counter any of his points or raise any evidence in your favor outside gishgallop links which you provide without explanation or demonstrated understanding.
I don't know or really care who's right because it's meaningless but you certainly don't look like the person with a valid position here.
Yeah, especially in the southern hemisphere, a few centuries later we might have slightly different genetics through rapid evolution via population collapse but we'd probably be back developing with a bit more accurate folk knowledge and probably actually a lot of remembered tech.
It'd be terrible to the people it happened to but barely a blip in the life history of the planet from the first evolution to the last lifeforms leaving or dying.