The definition of cheating does not solely apply to "rules".
Other definitions of the word cheat include 'to defraud, swindle, to act dishonorably and also deceive', which means to hide your true intentions, to pretend you are playing on an even playing field when in fact you have hidden advantages.
So yes Albus, you have literally been cheating whether TUS allow it or not because you deceived your opponents, that is the literal definition of the word "cheat".