You missed the point in which the picture is a parody, making fun of the current market. As such, the fact that intends to transmit is amplified by the literary device known as exaggeration. Sheesh.
Anyways, the point still stands. Even Doom's bidimensional maps were massively more complex and open than most modern ones, multi levelled or not. There's a good reason why the launch of a new Crysis or Far Cry game are events by themselves, and that's because they bring something relatively unusual to the market.
Most current day FPS undestand level progression as pushing the player through a level by means such as explosions and moving vehicles, whereas in Doom you could take multiple paths at your own pace, not the one dictated by the developers. One of the things I hate most about CoD and Battlefield is the feeling of being the content inside of a syringe.