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That is at best *an* actual reason.
Other factors can be demonstrated: for instance socioeconomic status has an impact on which kids are doing what as they grow up which itself has an impact on who makes it to professional level sports.
There are also different sort of racial components at play: is the reason why there aren't any white NFL cornerbacks because there aren't any white athletes capable of playing NFL-caliber cornerback? Or is it because white kids with a certain athletic profile wind up as slot receivers in high school while black kids with the same athletic profile wind up as defensive backs?
If that's the case, why aren't NHL players mostly Black? Being larger and faster helps there too. I actually agree that small differences in means of normal distributions lead to large differences at the tail end, which amplifies the effect of any genetic differences, racial included. But clearly that's only one reason, not the reason -- and it's not even the most important, or the NHL would look similar.
Football and basketball are the two sports black American kids participate at the highest percentage. Baseball use to be higher but that has shifted to Spanish/rural Americans. The reason for the shift probably has to do with the money/time involved. Get drafted out of high school and sign multiple million dollar and playing in the pros right away is safer than a low million dollar signing bonus and 7 years riding a bus in the minors
Does speed on skates actually correlate that strongly to normal speed?
> Black men tend to be larger and faster
Which I do not believe is true. As to whether it's reasonable to think that black men evolved to express greater physical prowess some very small proportion of the time, and whites did not, I can't say, though I doubt it enough I would expect the other party to give evidence for it.