I mean. The PDO point is not the same as SoS point. I think there is merit to the SoS discussion, but PDO generally always trends back to the mean over a long enough sample size.
Not necessarily a regression to the mean, that's a gamblers fallacy similar to saying that since the last 5 coin flips were heads the next one will be Tails, but certainly you don't expect to keep over performing. In Vancouver's case I would expect them to have high PDO - y'all have great Goaltending and some talented forwards. But literally the current Canuck's team has like 8 players shooting like a standard deviation or more higher than their career average and I think it's fair to note that that's not likely to continue forever.
Many teams have had extended runs with large unsustainable PDO. In fact most teams that win the cup do have an extended run with good PDO. That said very rarely, if not never has that lasted an entire season and an entire playoffs run. Does that mean Vancouver is a bad team? Absolutely not. Clearly they're talented and deep. But I think it's fair to say they have over performed a little bit - how much is hard to say for sure due to score effects and that, but I don't think it's a stretch to say they've benefitted from some bounces.
It's also certainly possible that it does continue. I just think it's fair to state that it's not likely.
