Uh no, it's still an exploit. Nothing in the definition of "exploit" includes that. Can't just make up definitions of words like that.
Includes what? It's a good thing I never made up any definitions, and stated that yes, it is an exploit.
Plus, the word "cheat" just means "to gain an unfair advantage," and being able to directly detect players in the way he did is considered an unfair advantage since you're not supposed to be able to do that.
How is it cheating if anyone can do it?
he knew he [...] shouldn't have been doing it.
No, apparently he didn't, and why would he have known so?
yes they should totally should just have fixed every single bug in existence whether or not they've heard of it
programming doesn't work that way unfortunately
(The bug was only reported after he'd used it. They should probably fix it now if they haven't already.)
a known and accepted part of the game
Did you just not read my post or something? That's the impression I'm getting.