Nichushkin, with 9 goals and 1 assist in 8 playoff games, has been playing a key role in the Avs' success against the Jets and in the first few games against the Stars. Unfortunately for Colorado, he won't be able to help them win anymore.
What he means by that is that Nichushkin's decision hurts the team, but the player decided to to it anyway. We can guess it's making a lot of people unhappy in Colorado, as his nameplate was already removed in their locker room.