All that has to do with is lag switching and intentionally screwing with your network to gain an unfair advantage against other players. No studio, in the history of video games, gave a shit about the pve part of a game. You only hurt yourself by making the game too easy. Glitching, wall clipping, etc doesn't effect anyone else's experience and as such is no where near as important to curb as cheating in the pvp aspects of the game. Ammo glitch, God mode, auto aiming programs all are meant to gain unfair advantage against other players, no one cares if they are used in single player campaigns in any game.