Twitter censors accounts for reasons known only to itself, but in the case, truth telling is one obvious trigger for Twitter censorship:
Twitter censors accounts every day that don’t make the news and those are just as serious violations of free speech as this instance.
Twitter could trivially empower users to have free speech and the equally important right to not listen but also for reasons known only to Twitter, has chosen not to do so.
Free speech and the right to not listen are equally important.
What’s so difficult to understand about that?