Trump is not being punished for speaking. No one is censoring him.
Ever since the founding of the nation, it’s been clear that “inciting a riot” is what is being punished, not the words. It’s the action that is illegal.
For instance, if you stand on a street corner and say “Let’s all get guns and attack the Capitol” and no one pays any attention to you, no one is going to charge you.
Further, you can be impeached for things you say, especially when those things are clear intentions to ignore the Constitution you took an oath to uphold.
I’m sure the lawyers know this. It’s basic stuff. But facts apparently don’t matter to Republicans these days.