It's bullshit as it assumes that hunters and gatherers worked together in a form of an altruistic bullshit society. We today are fucking far from altruistic society. Even people from political left are egoistic double standard ideological fanatics whose values only apply to themselfs. Political right is just their mirror image. Hunters and gatherers are two distinct, you can say, sub-species with diffferent attributes and action-reaction pairs. What the "specialist" wrote in that article is for gatherers.