I’m glad that someone has a valid question, all I’ve encountered so far are these stupid viagara adverts.
My thoughts on your question: The story seems to be based, at least in part, on Graham Hancocks series of books about a lost civilisation (Atlantis?) which taught the hunter gatherers of around 10,000 BC how to farm and build.
That’s my immediate take on it at least (but that could be due to the fact that I’ve just been readings some of his books)