On one platform. He still can pull up a press conference whenever he wants just like every other president has done when they need to communicate with the public
If he always and at all times has unfettered access to a rabid following, there is no moderation, no mediation, and we get our current situation.
If a person cannot tweet they can still blog, newsletter, email, and even whisper their truth via their free speech to the next person all they like.
Private companies can censor. Censorship isn't the sole domain of the government.
Twitter is censoring the President on its platform. As is their right to do so as Twitter is not the government. At least the last time I checked.
The media has regularly ignored presidential press conferences they didn't care about for decades now. Bush, Obama, and Trump all had many press conferences that received minimal coverage. In that light, it's no surprise that a President would seek our a more direct line of communication.
Media can and has refused to publish his BS