Yes that was the Christmas wager, he oversold himself on that and realised he would not able to cover inevitable losses so blamed it on cheating and decided to steal the winnings from game players.
I remember the time that betking has a wager contest and I was on the first place with few hours left before it ends and the scammer cancels the promotion like nothing happened. I know they have the right to do that but I've never seen casinos actually did stop their contest/promotion specially if it is few hours before the end time