I'm not sure you understand the point made,
Choosing to use a 2-1-2 stack vs 2-1-2 spread or 1-2-2 forcheck is a coaches decision, but each of those components is well established, DJ didn't invent them, there's no magic forecheck that only Boston uses and nobody else knows, it's just a matter of finding the right combination of components to suit your personnel, and employing adjustments to what the opposition is doing. If they run an umbrella PP, you might switch from a box to a diamond formation, from there you might make some adjustments based on the set plays they try to employ, you might tighten your diamond and collapse more with only the one defender pressuring but even then, it's a pretty well established DZC scheme.
Bobby Ryan played under DJ as well as a bunch of other coaches, if York was full of it, he'd have called him out on it,
The issue isn't so much that we run a 2-1-2 OZ forcheck, lots of other teams run that same forcheck, but do we have the right pieces for that forcheck, are we identifying the oppositions tendencies and making the right adjustments, are we choosing to stack or spread in the right situations, are we getting overly agressive and failing to reload (that one was a big problem for a while).
There's a lot more to coaching than the system, so when people complain about the system, it's often not the actual system that is the problem, that's what York was getting at.