You are correct, but using this argument, pretty much all of our understanding of Physics is "unproven". All we do is look at what happens in nature and form th

You are correct, but using this argument, pretty much all of our understanding of Physics is "unproven". All we do is look at what happens in nature and form theories. Sure, we reason a lot and that to cut down the state space but at the end of the day, we have no way to be sure if what we know of Physics today is how our universe actually works. So validations like this are almost as good as it gets. The only thing that would be better is experimental observation refuting relativity or some other accepted theory.