Gabe Bankman-Fried, the younger brother of FTX's founder, tried to buy the island nation of Nauru to build a shelter to create a superhuman species in a lab.
I don't think there's anything fundamentally wrong with eugenics. Screening for genetic diseases before birth is eugenics, selecting the best embryos for ivf is eugenics. Believing that people with severe genetic disabilities should be counseled before conceiving is eugenics as well.
The issue is the way it's done and the reason for it.
It will do a pretty good job of it if it's an island in the central Pacific Ocean, 300km away from its closest neighbouring country.
It's like the joke about outrunning a bear, they just need to run faster than the rest of us. There are only 12k people on Nauru to outlast, and a few years of supplies don't take up very much space either.