When military teams responded to the Nidal attack, they had been very quickly informed that there was a Lawful-Neutral detecting boy there wearing strange clothing who must be (a) protected at all costs (b) not told or shown that Cheliax is evil; but they were also told that this instruction was never to be repeated to literally anyone or asked about further, and that is an instruction you follow in Cheliax. If the boy in strange clothing then channels positive energy to heal some of the response teams (dath ilani actual security expert: AAAAAAAAAAIIIIEEEE), you're obviously likewise not supposed to ever ask anything about that, or repeat it as gossip.
But the response team also, for example, found a burned-out archduke's villa in which most of the Security were dead and a handful of pretty female wizard students had mostly survived.
They saw a fucking godwar start shortly after this mysterious attack by Nidal.
They hear rumored, even - and again, here dath ilani informational-security experts spit out their drinks - that the attack had somehow been foretold a half-minute in advance. Why wouldn't that be something you could gossip about, if you were a privileged member of the Inner Ring? You haven't been told it's really seriously absolutely secret; and you haven't been told that because nobody sees how that information leaks the secret of Keltham. There's no particular, known government secret of Cheliax that the prophetic warning reveals; why would it be absolutely classified? Obviously, as a Security, you would not gossip about this with non-Security, unless it was really amusing somehow, because part of being in the Inner Ring is that you get to know and other people don't. But it's not attached onto something classified ultra-secret by a visible secret-leaking line of reasoning, so it's not so secret that even Security isn't allowed to talk about it.