The prisoner analogy is proving the point: outcomes can be real without being genetic.
And for the record, you brought genes into this. Calling it a “fundamental advantage” and later insisting “black people have a genetic advantage in athletics.” That’s why people pushed back.
I thought I wrote that Chelsea, say, has a fundamental advantage because of its local black population, not that black people have a fundamental advantage because of their genetics? If not, apologies, because that's what I mean. They could of course be the same thing, although not necessarily.
But yes I do think it's very likely to be a genetic advantage.