What matters is the people of the nation state, and censorship by their own government depriving them of information is absolutely hurting them. Government only censors people when uncensored information would cause their interests to conflict with those of the people in power.

Censorship is fascism. If you want bad ideas to die, let them be examined and discussion to proceed. When you censor ideas you don't like, you give them a safe environment to foster.

No it doesn't. When the citizens of nation state B have the right to freedom of speech and freedom to consume foreign-controlled media, then nation state B does not have the rights you outlined over its people.