AIUI, Eugine The Fourth is trying to suggest that there's something more than this going on: that black people are underrepresented in lists of successful people not because there are few of them but because they're mentally inferior for some (presumably genetic) reason.

Black people are not a tiny minority globally, so to first order it would be evidence for that theory if in fact lists of successful black people look like lists of successful Turkish people.

Of course there are other factors; e.g., most of Africa is grindingly poor -- though I expect Eugine would say, or at least imply, that that's because Africa is full of mentally-inferior people -- and while there are quite a lot of black people in the USA they've historically had some difficulties to contend with.