If I were a judge you damned well bet I’d be unfavorably disposed to anyone saying “this is rigged” before the event.
The first amendment does *not* cover defamation of character (libel or slander), just as it does not cover incitement to riot, assault, or revealing classified intelligence (unless revealing such is in the national interest and shouldn’t have been classified).
If he knew his claims were false and still made them, therefore painting the parents as liars, that is *not* covered, never has been, never will be.
Having said all that counselor, how is this whole thing not a political witch hunt against a man who has been attacked and marginalized for years by the Leftist Mainstream Media and Social Media platforms? Or would you say blind justice is not blind and not justice?
Saying the law says what it says. Your or my opinion of if someone has been “marginalized for years..... “ is not pertinent to the matter. There are things you can’t say without getting sued.