Plenty of "human biodiversity" (neo-race science) nonsense like this floating around. The back half of the article amounts to the authors taking the premise that blacks are cognitively inferior to whites as a given, and then throwing up their hands and saying "Look, we examined the evidence, and the only explanation that makes sense is that they're genetically inferior!", complete with laments for poor social science researchers who have been unfairly persecuted for their objective, scientifically-minded investigations into the reasons why black people are just so damn stupid.