In that case, I'd recommend switching to phrases like: "Maciej may or may not have cheated", "Maciej may or may not have tried to game the system", "He may or may not have tried to stack the deck" and modifying the rest of the tone of your comments appropriately. tptacek, who knows Maciej personally, seems confident that he did not.

In the comments on the new guideline about gratuitous negativity, the intent seems to be "use the most charitable interpretation". Accusing someone of being dishonest falls outside that.