[didnt watch the video, but....]
Bad guy sits in the parking lot near your car. they intercept the signal when you open the car. The signal value changes so this is a limited time exploit, but they follow you to the next store or your home and they blast the signal in the hopes it unlocks the car.
OR
Bad guy sits in the parking waiting for a car. They intercept the signal when lock the car. The signal value changes so this is a limited time exploit, but as soon as you are out of sight, they blast the signal in the hopes it unlocks the car.
This has been around for quite some time and isn't all that complicated or expensive. It's also easier to drive up with a tow truck and yank the car. Or to smash the window and grab the purse/laptop. Depending on the socio-economic level of the perp.
EDIT:
Watched the video now.. and yeah.. only shows a small fraction of the story, but what I said earlier.....
Okki