Its a word problem from school.
This does not jive. Opened as state above I can buy. But the stranger moving away from his own car out of blue tooth range would've cause his car to lock. Made up story for the papers, click bait.
No, think about it. The guy claims he used the app to open the car but entered the wrong car and drove off. He actually used the app not as hands free. If he opened the app and went to controls and hit unlock the car doesn't lock again. Everyone is assuming he used only Bluetooth and walk away lock but he doesn't say that. He said he used the app to unlock his car.
If he does have walk away lock on anyway and we consider that he was using handfree the other option is he did something that made it not lock to begin with. There are other ways cars don't lock but nobody reads the manual.
From the manual:
A phone key or paired key fob is detected inside Model 3.
A door or trunk is not fully closed.
The phone key's Bluetooth setting is turned off.
A phone key remains within range for ten minutes or a key fob remains within range for five minutes after all doors have been closed.
The driver does not use the driver door to get out of the vehicle.
If Model 3 detects an authenticated key for five minutes after you exit the vehicle and close all doors, Walk-Away Lock disables and doors do not lock when you walk away. In this case, you must manually lock your vehicle until after your next drive.