I am certainly not saying that Alex Jones is a propagandist, but that Musk is trying to identify that fine line beyond which free speech might be damaged. Alex Jones is a person who revels in conspiracy theories (whether they are correct or not) and that is why he finds himself on the other side of the line.
Free Republic is not a free speech platform.
Gab IS a free speech platform.
Compare and contrast the content of those two forums.