It's been maybe fifteen years since I read up on those rules, I assume some things changed, but there weren't much details on this then. Do you have some relevant quotes?
This is also what I thought when reading the rules. It does say the race if you can't tell by the eye is decided by the photo-finish. But from what I read at no point does it say, the finish is where the photo-finish points and the paint is just arbitrary.
