This should result in an instant dangerous driving charge for the driver. Drivers are required to be in control of their car - you can’t put the responsibility on the “autopilot” - and to monitor the car when it’s on autopilot, being ready to take over at any moment. I would say that this driver clearly wasn’t ready to take over at any moment.
I still think this technology should be banned, for the false sense of security it gives drivers. I would not trust any of these self-driving systems enough that I could actually relax while driving, and staying alert and ready to take over at any moment sounds more tiring to me than just driving the car myself.
I agree.