Definitely just Grisha himself, if we're being honest here. This is probably his idea of a joke. 'Ha ha, you pencil pushers! Look at this elaborate and threatening message!'. We should have him detained for making threats against the Agency.
Nah I like the guy. Also he's way too dense to be able to write anything in code. Unless it has something to do with hockey
Of course you would like him. It's not like the code itself was that complex, after going through the most basic level of training that Div 79 offers you'd be more than able to compose something like that.