Pretty sure that any exploit that involves lying falls into that category, yeah. If the player isn't lying, it's not an exploit -- everything works as intended and honestly. If you have to lie to exploit (and not in character lying to fit a narrative, but to another player lie about the mechanics of the game), then it's not an exploit, it's outright cheating. So covering up intentional lying as an exploit and then diving into the passive aggressive routine of 'your players are morally inferior' is bogus as hell. Don't buy it for a minute.
If you're going to argue there's an exploit here, it's only if players lie to other players to achieve it. Please continue to defend calling out lying as a bad thing as somehow doing something wrong. I'll short circuit that and clearly say that lying to other players about mechanics to 'win' at D&D is wrong, and players that do that are cheating. And that's morally inferior to not cheating in most moral frameworks you'd care to posit*. If I had a player or players that felt this was something they'd do, they'd be out or I'd be out. Bad gaming is worse than no gaming.
*except utilitarianism, but then you've already brushed up close to the repugnant conclusion.