Is taking advantage of in game glitches cheating?

yes it is anytime you take advantage of a in game glitch it's cheating even if the company making the game hasn't fixed it in a long time. You are racking up cash and xp which can be used to get 3 doughnuts every time you reach the level cap at 38 (which you will get much faster then anyone playing normally).

so technically yes it's a cheat, it's not in the same ball park as modding the game to give you unlimited doughnuts but it's still abusing a glitch and thus still a cheat.

judging by the poll results there are a lot of cheaters here :D