You can put an asterisk over anything if you really want to be a stickler. For example, Steph Curry barely played, Kevin Durant didn't play at all, and Kobe Bryant (a retired player with ties to dozens of players) died violently.
The way I see it, an asterisk is helpful in a historical context to denote 2020 was the year thousands of people died and the league shut down for over four months (additionally, there was an entire social movement as well as murder hornets for a week or so). History books should at least mention that, right? Like I said before, if anything, current circumstances makes winning the title harder. There's the emotional toll, no home court advantage, no fans etc. In the long run, we'll view it the same: a championship is a championship.