It's brought up, but the main point of the video is that RollerCoaster Tycoon was one of the last major retail games made by a handful of people (Chris Sawyer for design and programming, Simon Foster for graphics, Allister Brimble for sounds/music), and managed to become the best selling computer game of 1999 despite going up against games made by teams of at least a hundred people. That's what he means by the game being "the last of its kind".