I would expect Trump's lawyers to point out that blocking on Twitter does not block access to information, as blocking on Facebook does. On Twitter, you can see every public tweet if you aren't logged in. On Facebook, many/most posts are not marked Public and so you have to be logged in (and sufficiently linked to the poster) to view them.
Of course, there's still the issue of the inability to reply to the comment and engage with the poster on Twitter, but IMO (as a former lawyer) the bigger issue is access to information, which is less restricted via Twitter blocks than FB blocks.