Their definition of “classic” is rather contrived in my opinion. “Classic” means both old and influential. They ditched the influential part. From their in-depth article:

It’s hard to define exactly what a “classic game” is, but for the sake of this study, we looked at all games released before 2010, which is roughly the year when digital game distribution started to take off.

Our random list of 1,500 games was taken from MobyGames, a huge community-run database of video games.

I can’t feel sorry for the slow disappearance of some Wii Shovelware from 15 years ago. Time is ruthless to all mediocre media.