Yeah, so McCaffrey is considered to be an outlier, a White guy with "foot speed" as LaVar Ball mentioned how slow White guys caused UCLA to miss out a chance at a NCAA title.
Pretty obvious genetics have a huge role to play in any kind of field/task that requires "natural" ability. Nature plus nuture. Still, the fastest non-Black sprinters right now are East Asians, from China and Japan, of course you got someone with clear mixed racial traits like Wayde Van Niekerk breaking a long time WR and also recently running a very fast 200 while slowing down early in the race.
In the end I think stereotypes do hold people back and overall play a role in a small number of White sprinters and runner backs. However in the end, if you don't have the genetics to grow to be a coordinated 6'7 guy who can vertical jump 36 inches, your chance of becoming a NBA player is pretty slim. Take it for what it is. The same goes for any individual in other fields, science, music, literature, art, etc, the people who have achieved tremendous accomplishments in those areas aren't born everyday.