well i guess it was a common and easy distinction to me between plastic with a layer of paint applied on top (ratchet) compared to coloured plastic with no paint applied over the top (most of the white bits of wheeljack). thats what people mean when they say unpainted. because it hasn't been painted on.
so if the wheel jack body had paint applied on top of the plastic it would be better. this seems to be what they have done with the wheeljack + version.