He's signalling contrarianism, specifically an anti-progressive political attitude. Note that the first sentence is a statement, and I would bet a large amount of money that it's true, based on no more evidence than I've seen on this page. The second sentence is pure snark.

What justifies my position is that for another supposedly matrilineal society that academics love as absolutely wonderful and highly functional, the Mosuo, folk wisdom is that it is composed of whores and pimps, similar to the culture celebrated in rap music and game blogs, where there is no significant transfer of consumables to women and children, and large transfer from women and children to a minority of men. Thus in addition to sociobiology, I have folk evidence, evidence from low status people, that academics are making stuff up.

He explained it in another post. To be honest if when I first read this I was a step or two nearer to him in inferential distance I would have probably found the comment witty. Considering he has spent some effort to shorten the chain, I'm changing my vote on it.