The only thing I can think of is that he was giving someone else information to bet on his games, but I would think the league would have gone for a permanent ban.
But It has been said that the NHL was notified by the betting site based on activity on his account. So the infraction occurred on his account. It would be really dumb to give someone else inside information to place bets on an account with his name. That would be construed as him betting on the NHL too, even if his friend logged on, since it was from his account.