I'm with you on this one, and the Bolts are my second team so normally one might find me grasping at straws to defend anything about them instead. I appreciate you giving them credit for winning the two COVID cups - after all everyone was on a mostly-level playing field both years they won (only reason it wasn't more level was in 2019-20 not every team ended up playing the same amount of regular season games). As for 20-21, everyone played 56, and one might argue about the whole divisional season format, but that's why North American sports leagues tend to have playoffs in the first place - teams don't play a balanced schedule even in "normal" years in the NHL. This isn't European soccer or something where everyone plays everyone once at home and once away. You can fairly crown a champion for whoever's in first place with that kind of setup.
The fatigue from when the games were played just doesn't compare. The Bolts played 65-70 (or whatever) games, stopped in March with several months off, won the cup in the fall, then had a few more months off before playing again (and it was a shortened season at that). Just not comparable to what the Panthers have done so far. Back to back finals in full-length seasons, plus 87 games already this season.