If the direct censorship (algorithms, moderators) does not suppress content, the indirect (bots and incentivized brigades) suppress it.
That's like saying, if I recruit some friends to plot a murder, and even attempt it, I'm protected by "free speech."
And anyway, "free speech" only enjoins the government from prohibiting speech. It does not protect the consequences of that speech, such as the classic example of yelling "fire" in a crowded theater.