I think Graham claims and infers a lot more than that, but I kind of like his style anyway. I think a lot of us were told in a general way that people long ago were very primitive and stupid and I like things that challenge this notion, it's clearly quite wrong and I believe the agenda there is largely to support "enlightenment" ideas without challenge.
I'll look into EU more, I guess I'm not well read up on it enough to say more. I will say though (it's obvious) that old / ancient knowledge is not correct by virtue of it's age or reverence by peoples or cultures in which it was developed. If you don't let the research guide you then bias is baked into the results. But that mightn't apply here!
In any case thanks for putting me on to EU, regardless of what it turns out to be 😁