He is killable. He plays the game just like everyone else. He can also get grumpy, be funny, and can get pissed at people. He's human, I wish people would stop acting like he's a god. This is why he needs alternitive accounts, as he doesn't want toge t attacked by the entire server population hen he joins. Also, the only power he has on a server, other then what normal clients get, is he can ban people on the master server. Not like he achally uses that a lot, though.
People can still:
echo(findclientbybl_id(xxxx).getaddress());
echo(findclientbybl_id(0).getaddress());
Or even, when a player joins, their IP is displayed. Someone can puzzle matching IPs and boom, he's exposed.
And that's not including typical IP changes, which would make it harder.