There's not even any compelled speech argument that Twitter is being forced to speak about something it does not want to. Twitter is a corporation, not a person. It has no right to exist and can have its business license revoked.
Now, if Twitter does want to make each Twitter user's speech its own speech, then maybe Twitter might have grounds to make a 1A stand. But as is Twitter and all social media absolutely do not want to be held responsible for what they publish so, frankly, they can pound sand.
It would be different if Twitter were considered similar to a newspaper where Twitter acted as editor and could be held accountable for what they publish. But they will fight that tooth and nail.