> 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,

No, the protection against viewpoint discrimination in public fora is about the right to be heard in the context of the forum, more than access to information (it prevents the public forum from being a Potemkin village that serves as propaganda for the office holder rather than, well, a public forum.)

So, inability to reply would still involve the core problem that the protections is aimed at.