To be clear, that's not what Twitter is doing. They specifically state:

"Affected media entities are free to continue to use their Twitter account(s) to organically participate in public conversation"

What they're doing is blocking paid ads by governments and deceptive practices by everyone. But they're fine with governments spreading their ideas on Twitter the old-fashioned way, by tweeting things under their own name and getting lots of likes/retweets.

And, obviously, Twitter has no power whatsoever to shut down governments spreading their ideas the old-fashioned way off of Twitter.