Fact is, nobody can get banned. It's not a cheat. It's a glitch. Using glitches in games is very common and not a bannable offence. Crota is defeated like the game requires, with the Sword while he's down. All they'll do is fix it so Crota wont stay kneeled, that's it. They can't even pinpoint the difference between leaving and lagging out, so there's no use to even try it. There's no direct modification to the game or server. Only an exploitation of an error which they clearly need to fix.