Just taking a shot at this…
powerlifting does not really translate to athleticism. A powerlifter likely has short limbs and naturally thick wrists/forearms/knees/legs. In other words, their bodies are ideal for power and explosiveness… not athleticism overall. You ever notice how a lot of black guys have naturally athletic bodies even if they have know muscle? Waists narrow as fuck, wide clavicles/scapulas. Yeah… their builds are just naturally more conducive for overall athleticism as opposed to brute strength / pure power.
I’d say whites are genetically predisposed to be stronger/more powerful than blacks, but blacks are far more athletic overall. Sure, whites might take strength competitions, but blacks dominate bodybuilding, combat sports, and practically every physically demanding sport played today.