Really? What are you supposed to do if there is a fire? What if you think there is a fire? What happened to "see something, say something"?
They use this example to censor people who were raising issues with the vaccine and Fauci. But think about it, to do a proper scientific study can take 12 months to collect data, and another six months to evaluate the data. Since it might take six months before there are enough people vaccinated to start collecting data it can take two years before you actually had proof. So back in 2021 when they mandated the vaccine we didn't have scientific proof there was a problem with the vaccine. Still we had lots of reasons to question it. Yet the justification for censoring us was it was likened to yelling fire in a theater, you have no proof of a fire, just a hunch.
I would say you do have freedom to yell fire in a crowded theater, but like any right you also will be held accountable for your actions. The right to bear arms does not mean you are free to shoot innocent people. Freedom of speech doesn't give you the right to slander others. Instead it prohibits the US government from censoring you.