The notion that Hakstol changes his system to “super passive” late in the 3rd with the lead is an utter fabrication.
They take fewer risks, but they still frequently send a forechecker deep with a 2nd forechecker being pretty aggressive.
The problem is the desperation of the opponent to score leads to heightened pressure in the Flyers’ own zone, & the team falls into a vicious cycle of failed clears & icings because they aren’t a deep team.
It’s not a system change. It’s icings, turnovers, & failed clears causing excessive defensive zone time.
As has been explained to you multiple times, the bench management is what causes the change.
By benching everyone who has the ability to move the puck, the remaining trash players on the ice end up in a shell and then just dump the puck out and hope they can change before the opponent gets the puck back. It's indisputable that the team abandons any chance at scoring at the end of the game and just goes into the shell. That's all guys like Hagg, Mac, Filppula, Lehtera, Manning, etc could do. Hakstol knows those guys aren't going out there to score a goal.
I doubt Hakstol literally says the words "don't try to score a goal" but that's EXACTLY what his actions say.