That's ridiculous. You think Elon Musk goes around reading people's tweets and deciding what he wants or not? Or trained an AI model to only allow content that suits him?
The guy literally gets community-noted every once in a while. It's free speech.
When Elon first bought Twitter, they released a bunch of information on how governments (specifically the US government) was pressuring Twitter to remove content, often for political reasons (i.e. it was a conservative account, etc). He stopped doing that, and generally supports free speech on the platform; sort of in a 2008 reddit way
