Here's the difference - we have firewalls on the Internet.
What they're saying is that the Bluetooth is sitting on the same network as your anti-lock brakes and there is no firewall.
Not sure about you, but where I work, if I didn't put a firewall between the internet, and my web servers and at least one more between my web servers and the database, I'd be looking for a new job. These guys hooked it up to the "internet" (bluetooth) and decided they didn't need any additional security between there and the "database" (your brakes).
Security is all about layers, and they've said that Bluetooth is all the security your health and safety critical systems needs. Not sure about you, but that doesn't leave me with a warm and fuzzy feeling.