Who cares, a win is a win. Should we put an asterisk beside the Raptors' championship because they beat a depleted Warriors squad? What about the Championship won during war times? The Leafs won two Cups during WWII, should we exclude those? It could also be argued that the Leafs, who won three straight Cups from 1947-49, did so as their team was the most suited after the War due to their young talent and the ease at which they could get back into NHL form.
The reality is, it doesn't matter how or why the Leafs win, there will always be 30 other teams who will try to claim how the Cup win wasn't legitimate.