A private company stopping people spewing misinformation to huge numbers of people using their private platform isn't "censorship".
The problem with "some people only use facebook for news and so this means they are effectively censored" is "some people only use facebook for news". Fix that, don't try to force services to broadcast obvious harmful nonsense to people.
The idea of truly unfiltered free speech on a global scale is impossible, because you have to be heard and we can't let everyone broadcast to everyone: there is too much noise. Free speech does not—and has never meant—the right to every platform.