Pollock was a regular part of the NHL's playoff team meaning he will have to be replaced this time around. The veteran officiated more than 200 NHL playoff games and more than 1800 career games total. That being said, he was not going to officiate in the playoffs this year anyways, as the NHL has a rule that states officials must retire before the playoffs.
Pollock's presence will be missed, although many fans won't be sad to see him leave the league. After all, being a referee is a thankless job and the refs often take a lot of abuse from fans both online and at the rink.