Maybe I am wrong but I think that his Twitter is perhaps compromised and its not him posting. He is a smart guy. He probably has iron clad security.
Because I find it odd he would post fbi please help or saying his PGP is compromised which wouldnt do anything related to his hot wallet. Only the software he signs.
Also if its true cold storage its not possible to get that stolen. I think that his Twitter is hacked due to the leak last week and he is going to post a please send donations tweet and thats the payoff in this hack.