I agree with your comment, but I understood the author's level 2 as something which can be realized with existing technology. Meaning there is already a prototype.
There is no prototype for complete full driving, including very difficult situations - so I see that as level 3.
Level 2 says Tomorrow as in technology that’s in development. I read Level 3 as when people talk about the potential for say intersections without traffic lights and the end to gridlock. That’s not just exaggeration or extrapolation of current research but hopeful projections without anything even vaguely in the pipeline for development. Aka the semantic web and other rather grandiose ideas.
The first generation of cruse control didn’t shift gears making it useless for maintaining speed up and down steep hills but it provided the basic functionality on a reasonable subset of roads. It was still called cruse control. So, my point was a Tesla’s ability to drive from a limited set of parking spaces to another set of parking spaces by crossing public streets, covers the basic description of self driving. It’s a poor implementation but fulfills the basic premise of you not having to turn the steering wheel and ending up your destination even if it has a host of limitations. Doing that but in Paris is really more of the same.
There is no prototype for complete full driving, including very difficult situations - so I see that as level 3.