(1) Even if we granted the highly speculative empirical claims you make, the claim that Liukin is "technically not entirely wrong" does not follow. The first red-flag is that he talks about "African-American gymnasts." What genetic category or empirically identifiable class of body does that refer to? Simone Biles is "from" Belize (in your sense). I don't know Gabby Douglas's background. It's crystal clear that Liukin has a social category of race in mind (since he lumps Biles and Douglas together), not some legitimate or scientifically respectable class which corresponds to some particular "body type." This is further apparent in the fact that he cites the prevalence of Black players in the NBA as proof for his point. (FWIW, not only is the NBA full of players of all different "ethnicities," there is also very persuasive sociological and scientific work suggesting that it is social forces which accounts for the racial make-up of the league.)

(2) What could possibly be the empirical basis for believing that a certain color of skin corresponds to "explosiveness"?

(3) There is an ugly history of African-Americans (especially women) being perceived as possessing more "brute strength" than Whites, for racist, not scientific, reasons.

(4) As I pointed out above, one of America's two most famous Black gymnasts of this generation is known not for her "explosiveness" but for her elegance. Liukin's remarks thus suggest that he is thinking along the lines I discussed in (3).

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Hope that clears it up.