Whilst I generally agree with you in regards that there wasn't a rule in place in the last curtailed season, and there may have been one agreed prior to this season, it seems that every other league that didn't finish their season awarded the league on PPG. There were quite a few too I believe. The AHL were not going to do so but I think had a change of mind. I doubt all these cancelled seasons around Europe/The World had clauses in place for cancelled seasons.
The EIHL decided against it for some reason. Might have been something to do with brexit!!!!
Steelers have been by far the best team this year tho so if there is a league winner in a curtailed season it will should be them