I do not believe he has polled everyone he knows. I believe he has polled enough trusted folks to generalize. Or that he has a bloke or 3 buddy who is in a high enough position to CONJECTURE THAT THEY OUGHT to know.
I keep telling him that Compartmentalization would prevent that but, of course, he doesn't agree. His own clearance is evidently very very high.
I don't think anything but TRUMP outing Q at a future time will convince him.
Don't mean jack if you ain't read in. Need to know. Any of his buddies that actually 'DID' know would say they didn't. How it works.