The worst thing is, even if they were right (they're not), and their ideas were ethical (they're not), their "solutions" betray a massive misunderstanding of how genetics and breeding works; especially in humans. Humans are, as much as we hate to admit it, horribly inbred. Not too long ago our entire population dipped to potentially less than 1000 breeding individuals, and as a result of that our genetic diversity is not very good. On top of that, there is literally more genetic diversity inside of Africa than there is outside of it, because all groups outside of Africa stem from a few groups of migrating populations.
All this comes together to say you are not likely to find any person who is not a carrier for at least one genetic issue. So you have the option of either selecting for people who have no genetic issues, which will have such a small breeding population that your desired Übermensch will be glorified human pugs within a few generations; or selecting against specific genes, which will result in the same effect, just on a longer timeline, because one genetic disease being eradicated will never be enough. Plus, a lot of the time, genes code for more than one function, and "harmful" genes may be beneficial in certain conditions.
In short, not only are eugenisist tech bros dumb, stupid, and evil; they're also just plain wrong.