I doubt it, too; but using methods you've broken, but know others haven't, is a great way to convince people you haven't broken it either. And if you suspect they have, it's a great channel for misinformation.
You could also embed content with stronger security inside the wrapper you’ve broken, so even if someone else has figured it out, they can’t decrypt your real messages.
That's not the case. With compartmentalization as a core organizational design, the people with the crack won't be saying anything to the operations and infrastructure folks.
A key portion of an advantage like this would be who to share 1) derived intel and 2) capability with.