It's basically ignoring at least 4,000 years of human civilization prior to that. The stone age is generally when people start talking about the origins of humans, despite us existing for a couple hundred thousand years prior to that.
I suppose I'm not conflating "rise" with "genesis". Human organizational structure was slow to ramp up and I don't think the bronze age is a terrible place to draw a line and say "this is where things start to heat up".
Drawing that line there allows one to claim that Native Americans and other indigenous cultures aren't "real" civilizations, and therefore their citizens aren't "real people," depending of course on the level of bigotry and conservative/religious ideology that one is promoting.
The biggest issue I see here is a man with clearly a great enough surplus of food to bulk. That wasn't happening unless you had access to a large farming community supporting you at the expense of most others and at least a rudimentary knowledge of nutrition.