I know nothing about biology, I know that I know nothing, so if someone decided for whatever reason to appoint me to the position it would be fairly harmless because I would defer extremely heavily to people who actually know about this stuff.
If he had appointed someone with proper medical or biological training, that would be fine because they actually know about stuff and can make informed decisions.
RFK Jr. is the absolute worst person because he thinks he knows a lot about biology, but he actually knows nothing, and is largely informed by a lot of conspiratorial nonsense, meaning he has the potential to cause a lot of irreparable to the US healthcare system. He's not going to defer to actual expertise, he's going to defer to idiotic blog posts filled with anecdotes about how a friend of a friend of theirs got a vaccine and it was bad.
I cannot imagine that this attempt at chicken eugenics will work as intended. I suspect that if this were a good idea, it would have been tried already.