The 1938 Hawks tend to be considered the worst winners in history:
In the middle of 3 season of less than 15 win's in a row, 41% GF.
In the playoff they were +5 (26 GF to 21 GA)
The best of 3 round form and best of 5 in the finals made a fluke significantly more possible than 4 rounds of best of 7.
Montreal is +12 with a regular PDO, they are a bit fluky penalty killing wise and capitalising on the high danger sense that are not sustainable, but I imagine most recent winners had some aspect to them that was unsustainable during a phase of their winnings run and good puck luck.
They would be seen has a candidate for sure, but next season would determine it historically, if Anderson, Toffoli, Petry, Price etc... continue to play well and have a solid season they will be less seen has a fluke, if they (like they would probably have the last 4 season in a row making it a fifth time) miss the playoff, they could become the flukiest post WW2 winner I think, but not of the whole history, going through 4 round of best of 7 would exclude them that honor, you still need to be doing a lot of things well has a team to go through that long elimination process, more than the 38 Hawks had too.
Also if they would be winning it against Tampa, that would be one of the though run opposition wise, not a case of good team falling and opening the road for them at all (like it happened in 1993).