I kind of doubt a mod or global janitor would willingly keep going showing us this shit, unless he is about to quit. It totally breaks their agreement thing. Once, accidentally as a giant fuckup on a screencap I could see, but not more posts.
Maybe someone who really really should not have been given that power was given it recently? Maybe it's a rogue tipping his hand a bit as a fuck you to the others?
If it was a nifty exploit we'll probably hear more about it soon as others find it. The initial post seemed to have no intent showing us this stuff so either was a planned "accident" to show off, or is something else.