Do you really think it's mirroring the phone's display onto the car's screen? That would be pointless, as you don't want dozens of irrelevant app icons cluttering your car's display. You want the basic controls that are useful in a car, with large targets that can be hit with a glance and later with muscle memory.
If you really think they are just mirroring the display, then you didn't even look at the linked Apple page.
