>What's the big mystery here?
The method that the thieves are using is unknown.
While those links to may be useful to shed light on this type of crime, they do little to confirm the method that these thieves are employing. Hence, there is mystery.
Agreed, there is a mystery about the exact details. I read TFA as suggesting that the fundamental concept of "car hacking" is unknown. I was responding more to the generalization that I felt like I observed, than to the question of exactly how this specific set of thieves is working. I should have been more clear on that point.
While those links to may be useful to shed light on this type of crime, they do little to confirm the method that these thieves are employing. Hence, there is mystery.