What you said about Kenyan athletes coming from particular high altitude tribes is interesting.
Still black people do seem to be physically faster and stronger on average. While asians are weaker and slower on average.
If there are physical differences between races, it’s not much of a stretch to consider there may be genetic differences in intelligence too. After all, the brain is simply the part of the body, just like the arms or legs.
Having said all that, obsessing over it is unproductive and honestly, kind of pointless. If we found genetic differences in the intelligence of different races, what do we gain from this knowledge? Nothing. Only fuel for racists.