Supposedly, Games Data Library indicated that the Switch actually did make it to the 6 million mark in 2020.
Not sure if people can confirm that or not..
Regardless, its an incredible achievement, whether it actually hit that mark or just came close to it. Sure, the pandemic played a factor in 2020, as it had in everything else in life. However, seeing a console sell this well and rank just behind the DS's two best years ('06 and '07) in terms of sales for individual years is nothing short of spectacular. The Japanese market has changed drastically since the Wii/DS/PS3/Xbox 360/PSP days. There were periods of shortages for the Switch, not to mention the rough release schedule partly due to the pandemic. Despite all that, not to mention the release of the next-gen consoles, the Switch was able to reach the milestone (or at least came really close to it) in such dominating fashion, even with the holiday releases being relatively low-key compared to previous years. Animal Crossing was basically the story and game of 2020 for Japan with Momotaro Dentetsu and Sakuna being the surprises for the holidays.