I can’t agree with what comes close to euthanizing people by not treating illnesses.
I you try to see it from his supposed point of view, you could argue that even ill people can make worthwhile contributions to society and advance humankind.
Developing tools (or even technology in the case of humans) is known from the animal kingdom to be a form of “survival of the fittest” hence in line with evolution.
You don’t have to be perfect to be good enough. The movie Gattaca comes to mind…