However, just because that sentiment was wrong in 2006 doesn't mean it's wrong now.
In hindsight, what was important about smartphone isn't what the established companies thought was important. Apple's core competencies translated over extremely well to what was actually important, which turned out to be user experience, full internet access, apps, and such, rather than things like telephony and data frugality which is what the established players concentrated on.
It's possible that the same thing would play out with cars. But I'm skeptical, and I'd want to see some explanation of just what advantages Apple would have, not just "they did it before with phones."
It's also not clear they understand the market or sales environment at all.
(They even guessed the name)
The iPhone is not that different from the Palm Pilot.
They weren't first on MP3 players, smartphones, tablets, online music stores, or smart watches, either.
I'll also add that this is a service economy, and while Apple get accolades for their physical products, even Apple fans say that their service offerings kind of suck.
It's early days in self-driving cars, and Apple has a lot of talent, a ton of cash, and (generally) a huge amount of desire to nail the user experience in ways other companies cannot or will not. Clearly their project is experiencing issues, but I wouldn't count them out.