Regardless of whether he’s savvy or not, he’s always seemed “connected”. So while we may discount some or all of what he thinks...he is likely reporting what THEY are telling him.
The question then becomes, is that a real threat, OR, are they playing mind games, or both.
If he’s receiving emails from inside an agency, those are being monitored also. Time for a little counter-intelligence, the specialty this guy claims to have.
Furthermore, if he is telling the truth, he should be investigated immediately by FBI for maintaining a conversation concerning materials illegal to divulge to the public.
It is time for polygraphs down the line, with proper reassignments to the Aleutians, Antarctica, and perhaps Sudan and Chad.