Hard do find my trumptwitterarchive link after this long gone from twitter, but found this "matching" timestamp.
The three 5's are a dead ringer for the final (as of yet) Qdrop with the "We're Not Gonna Take It" music vid. 5:05:50 samp.
I ran the delta from last drop to 21:31 trumpdesk timestamp. First ting that popped out at me was "93, 1+3"… "Let's Roll" Flight 93 shit. On a more morbid note, could make "frame 313, 63" out of it. Whatever the case, comms of some sort are a sure thing.