I really don’t understand what’s so batshit about the claim that anatomically modern human with similar brains as modern humans could have built up civilizations and structures a few thousand years before the currently accepted dates.
It is as nonsensical as claiming that the latest Ryzen is really from the 1990s. Of course, this guys 'theory' is not based on actual evidence; so there is no reason to even take it seriously.
But they absolutely do. "Traces" of ancient societies are incredibly sparse, very little other than stone can survive for thousands of years. And what we call "civilization" rests on resource availability; when people only have enough resources for bare subsistence, social collapse is inevitable.