It seems like platforms could solve this by making it possible for users to see the content of accounts run by government officials even when blocked, but merely prevent them from otherwise interacting with them.
the official can decide to cover their eyes, but not everyone else's eyes
Let's say an elected official hung constituent letters outside their office. Would they be obligated to hang every letter received, or could they curate the letters in some way?
Every announcement is made in a public square, and once said, every citizen has the right to also shout in that square. The government official is free to cover his ears.
it's not their office, they're posting on someone else's office
the town square, if there is to be an electronic analogy, doesn't belong to them, and if there isn't, belongs to the website