There is no guarantee Novak would have won the AO if he played, he just lost to Medvedev in the US Open final a couple of months before, upsets happen. He knew the rules going in and decided to try sneak in and it didn't work, he has no one to blame but himself for not playing the AO.
Also, how would Nadal's career look if he was healthy for the entire time? I can think of a few slams Nadal didn't play due to injury or had to retire when he was a title contender. Certainly FO 2009, maybe Wimbledon 2009, AO 2014 he had to play the finals injured against an opponent he never lost to before, US Open 2018 he had to retire in the semis after winning the event in 2017 and 2019 so we're up to 26 hypothetical slams for Nadal so far.
There is no guarantee Djokovic or Nadal will dominate the slams next year, the competition is getting stronger, Alcaraz, Medvedev, Tsitsipas, FAA are all young and I could see them winning multiple slams each in the future. All we can assess is what actually happened, in the words of Nadal, if if if doesn't exist.
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