You seem to have taken several threads and tied yourself in a knot Lyndiloo, perhaps because you believe the Attorney General's comment, made entirely to raise the political temperature I feel, that the eleven Supreme Court Judges had made a new law. That was not their purpose nor what happened. What they did, with their expertise in the law, was clarify it.
If we take your example of a seat belt, yes, there is a law which says we must have them fitted in the car. This is a bit like you driving with one in the car and being stopped by a policeman, with precise knowledge of that law, pointing out that it is not enough to have it fitted, you must wear it too and that not to do so is breaking the law.
Johnson only took notice of the existence his ability to use prorogation, not the limiting factors.