Now looking at it again, the players have to be within 5 feet?
I dont know. It seems like a rule thats called at the discretion of the referee at this point.
Edit:
From the NHL Hockey Ops:
A too many men on the ice penalty is a judgement call that can be made by any of the four on-ice officials.
Following the game, Hockey Operations met with the four officials as is their normal protocol. In discussing the winning goal, each of the four officials advised that they did not see a too many men on the ice situation on the play.
This call is not subject to video review either by Hockey Ops or the on-ice officials.