I'm not sure why a bunch of folks are going through these mental gymnastics to define whether the 2020 championship was legitimate or not. It is. Full stop. It's was part of a season, yes that was unusual compared to other seasons, that was recognized by the authority of Major League Baseball and played under, pretty much, the same rules that all MLB games are played under. Not only that but all 30 teams were playing under the same restrictions and rules.
I'm not sure what the debate is here. There was a World Series in 2020. The Los Angeles Dodgers defeated the Tampa Bay Ray in six games to win the Commissioner's Trophy. What's the argument?
Just because the Sox decided to completely punt 2020, doesn't mean that the season is null and void.