It’s not an easy season at all, and teams will have varying levels of success on how well they deal with these circumstances. Smarter coaches will try out their academy players when they can to be better prepared for a covid hit.
Somebody might argue that one team’s league win is less valid because, for example, that team got to the final with an easy club call fixture. Or their opposition lost a star player to an unfair suspension. Maybe one year’s playoff system was more fair than another.
You can only play in the conditions presented to you. How well you deal with those conditions, however, is completely up to you. If the trophy is awarded, it will be completely valid. Opposition fans will detract from it because their team lost.