I was involved in the thread to which the OP refers.
I did endorse “unrestrained freedom of speech”, but my intent was to address a secular, pluralistic social order. My thinking is more “unrestrained freedom of speech, when compared with whatever alternatives that might arise in such a social order”.
I always say “we do not have the right to believe (and thus speak) error, rather, we have the obligation to pursue truth”, even if, due to a broken, apostate social order, good people are going to “get it wrong” and follow error thinking it is truth. For instance, some people get hold of those little Jack Chick comic books and swallow them whole. Simple message, in a neat, often humorous little package, with an equally simple solution — just get saved in Jesus, and you’re all set for life and eternity. Talk about scratching people where it itches!
I also always tell my son “Our Lord didn’t give you the power of speech to talk trash and speak error, rather, He gave it to you, to speak goodness and truth, and to give glory to His Name”. No, untrammeled freedom of speech isn’t a God-given right. But in our social order, in our circumstances, it is the least-bad alternative where a good one doesn’t exist.
Now, as to a Catholic social order, such as existed in the Middle Ages. Obviously freedom of speech was curtailed where it veered into heresy, error, or blasphemy. That is good. But I have to wonder — what if, just if, there had been a widespread clerical sexual abuse crisis such as we’ve witnessed in the past half-century (because it goes that far back, even if it wasn’t acknowledged until years later)? Would it have been a crime to speak of it publicly? To use whatever methods of communication that existed, to “get the word out” and expose what was happening? To cast priests and even bishops in a bad light, when they basically ran society at the time? And what if the same things were happening in the royal courts — think a medieval Jeffrey Epstein scenario? Would it then be a good thing, or would it be a bad thing, to have something less than the “freedom of speech” we have as Americans under the Constitution? Or would it have been just “the way things are” in such a Catholic social order, while the innocent suffer in silence under the rubric of “protecting the reputation of Holy Mother the Church”?
Even if it does savor of Freemasonry, still, I’m thankful that we have the freedom of speech that we have. Again, better than any of the alternatives. I would draw the limits of free speech very, very wide — child victimization, possibly incitement to riot (but are not people free agents who can choose either to be incited or not be incited?), that’s about it.