Any system lower that SAE Level 5 is allowed to ask for human assistance at any moment. It can literally just start buzzing and ask the driver to take over for that left hand turn. That's the sucky part of the UX, so why would the marketers showcase it? I bet that wasn't even on the table when they wrote the script for that video.
The delay before the car's human needs to take over is one of the things making the difference between level 3 (human has to have "eyes on the road" and be able to take over in less than a few seconds) and level 4 (the car can put itself into a safe situation if takeover is not coming quickly). I really thing level 3 is insanity because of this short delay. I wish Tesla all the luck in getting to level 4.
That being said, Waymo has shown that their cars can do 4 way left hand turns.
Level 5 doesn't need human assistance in any part of its driving envelope, so manufacturers can omit the driving controls.
