You're right. "No factual basis" might be a better standard. The claims Trump made had no factual basis. Twitter's addendum highlighted that fact. Nothing more.

I can't believe that people are criticizing an organization for exercising it's right to free speech. Like this wasn't even a case of removal of content. It was literally taking a sign and sticking another sign below it. It's something that the government would be allowed to do to a private citizen. It's that far away from censorship. And yet.