The quotes you are using are familiar to me because I've cited them in my own essays. But none of that supports the theory that agriculture alone led to inequality and patriarchal dominance based hierarchies. Of course it's not a hard and fast year when things magically shifted and nobody has said that. It's an indication that around this time the mosaic of social systems tipped more over from egalitarian to not. But, we still had thousands of years of agriculture before that took place.