However, Musk's stated intent when buying twitter, was to make it a non-partisan town square. This comes with a context of the US currently being divided more and more into two competing "tribes" of similar size and power. (Ie. the perfect setup for a civil war.)
If you look at the "ethics" teams kind of like law enforcement, it's important that they are neutral to this partisan divide, and don't have a "My side good, other side evil!" attitude.
If Elon is of the opinion that Twitter has been engaging in a partisan way, it is natural that roles like this are torn down and built from scratch, where the new teams are thoroughly screen to make sure they have as little affiliation with each of the tribes as possible, and to make sure that any affiliation remaining is balanced between the tribes. (Kind of like one does when recruiting a jury for a high profile court case, and also how presidents should select supreme court justices)
Hopefully, Musk goes through with this the way he has stated, by aiming for non-partisanship, and not in a pro-Republican way.
Social networks like Twitter use ML to boost engagement.
It turns out this tends to lead to ML amplifying pretty destructive patterns... racism, conspiracy theories, ideological bubbles, anti-semitism, etc.
A company might wonder how to boost engagement without promoting these things.