Twitter is merely labelling a tweet as being factually incorrect, it's not hiding the content.
I know this is a very massive hypothetical, but it’s one I’ve wondered for a while. Basically, as the head of one of the branches, he could have subordinates forcefully removed, but who’ll forcefully remove him in this case?
In real terms, what are you imagining here? Trump having the NSA execute a DDOS against Twitter? I feel like you have to get to some pretty fantastical action-movie type plots to make this happen.
That probably won't happen though, this is really just about stirring up a frenzy of right-wingers so Twitter will have to bow down to them and give them more and more concessions in hopes that somehow, someday they'll stop accusing everything of being biased against them.