You are right it isn't his job to sell tickets in Sheffield but statements like this are designed to create hype, it is pantomime season after all, which is exactly what this is. If we lose he will look foolish, he is well aware of this. I'm more worried about the result of the actual game than what the coach is saying to the media pre game.
Paul Sullivan was doing Wally's podcast the other night and talked about the Devils world record win streak back in the day. & he said whenever they saw something negative about the Devils in the press that was then printed off and put on the dressing room door to motivate the team. So I only see downsides from Duponts comments.