After he was formally ordered by his commanding officers not to speak publicly about Bitcoin or his thesis. 
Discussion
Even after the book was pulled, he would tweet cryptically. Now bitcoin related tweets are completely gone.
ok, all the copies of the book have been confiscated to Area 51 bunker. they can't have good ideas propagating out and people teleporting and zapping.
He would tweet about "you-know-what" and then quickly delete the tweets. I talk with him on DMs.. he's just testing the length of the leash the DoD has him on. After he was ordered not to speak he deleted everything, then would occasionally tweet and delete them shortly after putting them out to test the limits of his orders. That's all it is.
I guess I just saw his tweets before he later deleted them. I went to find an old one and noticed they were all gone. I didn’t know that he tweeted and immediately deleted.
Can you link to the tweet from 11/1?