Earlier quoted context omitted.
It absolutely is if there is a severe population bottleneck that selects for some trait in the survivors.
...which has never happened in human history. Bottlenecks? Yes. Bottlenecks that selected specifically for a specific gene? No.
It has happened countless times in history.
See the sickle cell trait for instance.
I feel you're unable to discuss productively on this matter because you seem to think that believing in the concept of phenotypes means support for eugenics... which no one here is advocating for.