Whether he means for it to or not Twitter under Musk will never be allowed to be a truly free speech platform.
You cannot have a true free-speech platform, because it will be overrun with people trying to ruin it by posting neo-Nazi crap and all kinds of other stuff. There has to be some level of moderation.
It all depends on how you define free speech, doesn't it.
Some speech, such as libel, has always been illegal.