I understand the hypothetical and agree with it. Perhaps zero tolerance was a touch harsh. Being all inclusive is something I feel PB and this game in general does do fairly well. However since both sides have conceded that this case in particular is especially heinous, could I ask a favor, on behalf of the community, for this case to be reopened and reevaluated as to this persons punishment and ask that support/developers get in contact with the individual in question and make an attempt to find whatever hack/ who made said hack and make an attempt to shut it down and perhaps if they cooperate they have their account knocked down a whole division on both Col and Arena from say Plat 5 to Gold 5 and keep their account monitored for an unspecified amount of time to see if they indeed stay the course.
Then perhaps in the future have accusations of cheating handled on a case by case basis and look into it to see if it indeed was a child wrapped up in someone elses misguided attempts to cheat the system and see if they will be of assistance of how they got a hold of said tool or in cases like this have them permenantly banned from the game for their actions.
If nothing else we know that this wasnât an accident like proposed in the hypothetical and in this case where proof was provided in dividends (props to OP for doing so) and was clearly intended and malicious in execution and should be punished accordingly.