When you use a lot of phrases like: "Maciej cheated", "Maciej tried to game the system", "He tried to stack the deck", you don't make it sound like you think he accidentally took cold medicine - you're directly attributing malice to him.
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.
When you use a lot of phrases like: "Maciej cheated", "Maciej tried to game the system", "He tried to stack the deck", you don't make it sound like you think he accidentally took cold medicine - you're directly attributing malice to him.