Haven’t seen the threads, but offhand can’t see why fauna which survived multiple glacial advances would be killed by the last one.
That has been a puzzle for archaeologists (of which I am one) for years.
In North America, it was not the glacial advance that led to the mass extinctions of the megafauna, but the glacial retreat followed by a previously unexplained quick advance. That time period also coincides with humans and hunting, but they may not be the cause of the extinctions.
The latest findings suggest that the Younger Dryas glacial advance was caused by a meteor strike over eastern Canada, and that the subsequent rapid cooling doomed Clovis as well as much of the megafauna.
Do a google and find some of the threads/articles. It seems more plausible than most previous theories.