Um.... reread that comment. He's saying that VBIEDs are totally possible, and that this example of CAN Bus control isn't going to cause a new era of terrorist actions, because it's just as easy to do it with servos and/or ropes and cables.

What he's saying is not false.

What he's saying is that terrorists are doing it. Not that it's a potential thing, but that there are war zones where it is happening.