I would blatantly ignore that law. I am in a position to easily fight a state entity with legal resources. They definitely cannot regulate that constitutionally. As a private citizen I am not posting notices. It is bad law that doesn't protect anyone and erodes protected rights.
Potentially. I care a lot about this. I think this is a pretty easy case to fight them on 1A grounds as the case law is quite settled and clear per my understanding. So they can have unconstitutional laws on the books, but the long tail of that fight is against the.