Pasha, I'm shocked by you. Are you really kidding? Someone just had some fun, what's the big deal? In one of the games, before surrendering, I also entered a cheat code for laughs.

Each game is different; I'm sure you entered it as a joke while playing with an old, trusted opponent. And you probably apologized for the joke shortly after.
Positiv is a player with little experience. Last year, he messed up (showing his level of play) in a bear rush and inefficient move usage, then disappeared for a year. Now he's back, and he's showing amazing skill again. But nevertheless, he has a simply outstanding win rate. He and Dubrovin had a purely competitive relationship, not a friendly one. Why would he joke like that, and right in the middle of his turn?
Experience shows that even when caught cheating, there will always be defenders, so it's really something to keep in mind.