It doesn't follow though. Sherpas are a race. Black people are not a race in the same sense. The mechanism you are giving an example of is exactly why it's stupid to talk about black people as a race. Or genetics using terms like Asian, black or white, that have no genetic meaning.
People keep bringing up these fascinating specific cases as though they are the same as saying black people are more athletic, and I'm honestly agog at it. If I looked at that piece of genetic adaptation and said "Asians are the best climbers" as though if I picked some random Japanese person to develop into a climber, I'd have a great advantage, you would think I was fucking stupid. They aren't even the same people you'd say, if even remotely aware.
You've got Sherpas in Nepal inheriting a gene that had Darwinian selection over many generations from Tibetan ancestors. In that scenario you have a studied population with shared characteristics, a specific, relatively homogenous population, in a specific place. And then, you have evidence! There's a sensible causal connection there. Science!
Interestingly it does seem some people in the Andes do have genetic adaptions to high altitudes, from what I've just read, just not the same ones. Again, if you were to use lazy categories of race most people in the West don't even disambiguate the indigenous populations in these areas from the populations post colonization. Similarly, the question of who is black, and even more so, who is white, has had many shifting answers depending on time and place.
There are all sorts of advantages specific populations can have at doing very specific things that are studied. None of those populations are defined by cultural descriptors of race that have never had any scientific basis, or even any consistency of application.