This seems like a real non-sequitur. "Certain kinds of political speech were never really protected, by the way here's a great thing Communism helped with."

I struggle to see a charitable interpretation. It looks a lot like a thinly veiled attempt to push a pro-communism anti-establishment narrative. But it comes apart at the seams because to anyone that objectively cares about free speech, every Communist country has been far worse at it than the US. For that matter, you could just as easily have said that WW1 was ended, in part, by US military action.

Its one thing to have a political opinion, but your comparisons are dishonest and the way you slip it in as "just a historical observation" is even more dishonest.