Most of his work deals with the psychological and historical origins of morality/philosophy, as well as how it might change as a result of herd dynamics. This doesn’t mean he thinks AI destroying morality or mediating it is a good thing or that some Nietzschian “ubermensch” needs to create a universal AI morality. His whole point is that morality is not universal truth but comes in flavors (master vs slave morality). He doesn’t really even think truth or egalitarianism/democracy has any inherent value (all ideas this article seems to negate).
In my opinion the biggest Nietzschian idea we can pontificate on in relation to AI is the concept of “The Last Man”, which describes Nietzsches prophesized end state of humanity in the post death-of-God era — men just want to be safe, satiated, and friendly to each other (which we are in):
“No shepherd and one herd! Everybody wants the same, everybody is the same: whoever feels different goes voluntarily into a madhouse. Formerly, all the world was mad,’ say the most refined, and they blink. We have invented happiness, and they blink"