Level 200 noblesse?

"Because you can do it in a private server" does not mean "you can do it in the real thing".
A private server is not running the same code as the real server, it's an attempt to emulate it - It can be made to do anything because it has no actual limitations but what the coder puts there that need have no relation whatsoever to what the real game has.
tldr; You can make a class in a pserver that farts mushrooms that explode and wipe out whole maps including other players, doesn't mean you can do it in GMS.

Most likely you can't do it by GM / Server commands indeed, that's why it's either a GM that's testing a lvl200 Cygnus, or it's just a hacker editing himself in the database. And that's as easy as editing an excel sheet... That is... when you're in... xD