"This incident involved Tesla’s “Smart Summon” mode. As the owner/driver, you are supposed to be within line of sight of the car. You hold a button on your phone and watch your car leave it’s parking space and come to you. If you ‘See” anything that would impede it’s travel, you release the button and the car stops. The car uses the lines in the parking lot, etc.

In this case, the driver/owner did not stop the car by releasing the button on their phone. I have no idea where they were, of course, or even if they were watching the car, as required. But this is an airport ramp - no lines! So the car was, in my opinion, “free wheeling!”