Yahoo will only update a player's status to IR once he's on the NHL's official IR list. And that only occurs after the team makes an official announcement to that regard. None of these events have occurred.
The player updates next to a player's name are published by Rotowire. And what Rotowire or any other hack journalist/blogger website 'reports' isn't always reality. It's always best to go direct to the source: the team and the NHL.
TL;DR - Marty isn't actually on IR. Lousy 'journalism' is to blame for the confusion.