According to the charts and descriptions in the article, it literally doesn't. The article shows Tesla firmly in the lead in capability/performance and ease of use and that Cadillac just nannies the driver more and turns itself off completely when not on pre-mapped divided highways with restricted access, which is antithetical to making the world safer because it's only active away from where people currently die by the thousands due to human negligence.

CR's idea of goodness is that autopiloting should only ever be allowed on pre-mapped divided highways with restricted access. Since Cadillac's only works on pre-mapped divided highways with restricted access, they get high marks. But that's not better performance. That's worse performance with a geofence to hide the details.

> “Active driving assistance systems should only be able to be activated in low-risk driving environments, void of pedestrians and tricky situations, such as intersections and complicated traffic patterns,” Funkhouser says.

But this ignores the fact that most traffic fatalities happen from human negligence in the places where Cadillac's Supercruise explicitly disables itself, rural roads + intersections. If Cadillac's system only ever activated while parked in your garage they could give it a 10/10 for safety, and it would not make the world safer.