I think the big question here is not are they working on a car, but can they deliver a car that represents a significant improvement over what's out there. And that i'm highly skeptical of, unless they deliver full autonomy. But there is just no way Apple is going to beat Google to market with that technology.
So, I agree they're working on a car, but I feel fairly confident that it will be an absolute disaster for them. Though most times that's been said about their products in the past decade or two has been a disaster for the person saying it.