The contemporary Modern Warfare series is a remake of the original series. At least a general new take on a lot from that series. It isn’t 1:1 by far.

Instead of letting you launch each game individually, or creating a general launcher that you start and then pick the game you want to play… They chose to force players to launch MW2 as a fake hub, and in that menu, click the MW3 option.

The article says you can tell because apparently if you want to play MW2 you just pick the game type and it starts starving for a match. If you want to play MW3 you have to wait as MW2 shuts down and you wait for MW3 to start, after you already waited for MW2 to start initially.