Definition of cheese is a strategy or strategies that allow a player way(s) to complete something in a game not using the designed method(s). All cheating are therefore cheese, but not all cheeses are necessarily cheating. This Oryx mechanic is technically a cheese, but not cheating IMO. Pushing Atheon off the edge (same with Templar) I would consider the same as well, 100% cheese but not cheating. Glitching Crota from standing via internet connection is cheating. Lag switches are cheating. Again, just my opinion, but if it is IN the game then use it. If you are doing something to change what is in the game then it is 100% cheating.