We have yet to see how the site will define "illegal" posts.
Plus, "the voice of God" has already said "New Twitter policy is freedom of speech, not freedom of reach ... Negative/hate tweets will be max deboosted & demonetized" and then there was some stuff about not being able to share posts depending on the poster's "boost" that I can't find a link to now.
And we've yet to see what that actually means in practice, but on its face it sure sounds like shadowbans. People will be permitted to post, but you'll have to go to their actual profile to see their posts, and maybe you won't be able to retweet them or comment on them.
But,
So much of this is personal ego boosts for Musk, and pure unadulterated lying. When he does this at Tesla, he gets smacked by the SEC. And at SpaceX he's surrounded by filters and handlers, not least of which the FCC and NASA and the US Military.
Twitter is his own personal sandbox, you're getting to see a glimpse of what working for people like Musk is really like.
Imagine working in Twitter and trying to figure out what the actionable steps in any of this actually are ... it's hopeless.
So ... the whole thing seems like a wait and see. It's all just speculation at this point.