Guy:
It is fairly nuanced. Going back to the FA example, you could now argue that you're discouraging free speech by removing ambassadorship assignments for someone who attacked that region (e.g. In the context of TNP should close down relations with them).
The key difference there is the order of events.
It is not illegal, in TNP, to face
consequences for your actions and speech. If you insult or attack an allied region, you will be removed as an ambassador there. If you routinely criticize the delegate's approach to XYZ, you will probably not be chosen to be minister of XYZ or might be removed as minister if you're already there. If you're an ass, people will get annoyed with you.
But that - facing reasonable consequences as a result of legal speech - is quite different from actively trying to discourage legal speech before it occurs by trying to exact promises on pain of threats.
Also important, I think, are both the magnitude of attempted control as well as the broad jurisdiction. I think a delegate can absolutely forbid their foreign minister from sharing information about treaty discussions with outside parties. The minister serves the delegate and enacts the delegate's wishes and broad vision, and their actions and participation in discussions belong to the executive branch (it also helsp that sharing such information
without the delegate's consent would be treason - it almost goes without saying that prohibiting criminal acts is okay). But the delegate cannot prohibit, say, RA members from discussing any information that did get leaked amongst themselves, nor can election commissioners prevent a candidate from making a campaign thread, and so on.
At the time of the discouragement, flem was not an NPA member (and so not in the delegate's military chain of command), and the prohibitions were placed on hypothetical future speech, hypothetically assumed to be problematic or denigrating toward the NPA. Had flem been allowed in, sworn the NPA oath, and then later removed for violating its requirements to obey the chain of command and respect other NPA members, then I think that would probably have been legal and permitted.
P.S. Please don't stop posting here!