I don't think that the yellow warning sticker came into use until 71 production.
But was sent out to all registered owners of earlier cars with a letter instructing owners to apply the sticker to their space saver wheel.
In any case the paint markings are not consistent with ones found on other 70 Boss 302's Spare is not a reproduction, none have been reproduced but rim at least is likely from a later application.
Have not figured out the markings to the tread yet but those likely relate to the tire and its supplier not the completed assembly