2500 BC? Wow, that’s even before the Xia and Shang dynasty
I was a little put off by their calling these Neolithic, but as happened everywhere, the Stone ages ended at various different times. Having organized, dedicated burial sites is a sure sign that a culture is (literally) dug in, and not nomadic.
https://en.wikipedia.org/wiki/List_of_Neolithic_cultures_of_China