It might look funny in photo mode, but I don't think it will look too bad while spinning at 60 fps. They have a different model for the rims that get swapped in after spinning at a higher speed to appear blurry. It would probably be a pain/waist of resources to swap the brakes as well. Hopefully the brakes don't actually stand still while the tire rotates?
They could just swap the rotor texture, I don't think I've ever seen moving rotors look anything but smooth in pictures . Someone should point this out to them.