We have access to different data points today. But the way I read the original post is that human mind as such did not meaningful change. If you took a Roman or Egyptian embryo from 5k years ago and incubated it today, you'd have a modern human. The fact that many people back then had crazy ideas, is orthogonal to the biological argument at hand - and that's before we look at amount of people with crazy ideas today, many of which are largely the same.

Basically I think we have to pick a lane on whether we are talking biology, vs culture, vs knowledge and accumulated data.