What if we one day come up with a Theory of Everything that mathematically explains it all? That model would be “true” no? Assuming of course that it’s possibl

What if we one day come up with a Theory of Everything that mathematically explains it all? That model would be “true” no? Assuming of course that it’s possible to come up with a list of observations that covers “it all” and we won’t one day see something weird and new that contradicts our theory.