Earlier quoted context omitted.
You're making up a narrative for why suppressing free speech is acceptable in this instance, not discharging the notion that free speech was, in fact, suppressed. The fact that a conspiracy talk radio guy can get hit with a billion dollar fine for some off-hand nutso claim (that he subsequently recanted!) is a very unpromising barometer for the health of free speech in our country.
His speech isn't being suppressed. The government didn't arrest him. He's being sued for damages he caused to the families of the victims he lied about. That's as American as it gets.
I'd add that he is still free to continue lying forever. No one is stopping him from doing so.