It isn't. They slap a warning label on clear falsehoods. (Not very effectively, I might add. If you think the subject can't be discussed on Twitter, you don't use Twitter much.)
Trump's suspension was for inciting violence.
That was the first phase, now you are banned if you suggest or present evidence contrary to the outcome.
I suspect we have differing definitions of evidence.
Two thousand signed affidavits. Quite the conspiracy for all of them to make it up.