I think the word a lot of people are overlooking in Jumpin's post is "only".
Covid was obviously a factor, but it was not the only one. Switch also got its biggest killer app in 2020, Animal Crossing, which became a pop culture phenomenon and opened up the console to a whole new audience who wouldn't have bought one for Mario or Zelda or Smash.
Animal crossing came out at the same time lockdowns happened. It just happened to be the killer app people got with the Switch due to Covid.