lol these hackers are good trolls.
Like Stefan would shut down a game with thousands of active players making him hundreds of dollars a day from gralat pack purchases. And if they did, they wouldn't announce it by standing on the bank...
A server overhaul would not require an account reset... it could be transferred easy.
Either they found a way to avoid the name filter(and obvious wallhacks), or they brute forced the passwords of Stefan/Xor, and pulled this off. Graal has awful security, I wouldn't doubt that that is possible. Then again, if they managed to do that, they probably would have done something bigger like completely mess up the files or give everyone a million gralats or something.