that's wrong. Noether's theorem says that "energy is conserved" is equivalent to "the laws of physics are time invariant". If you assert that "energy is conserved" because "the laws are time invariant" that risks begging the question. At the very least you should be asking "ok, then, why are the laws of physics time invariant?"
We know that all of the laws of physics we observe at the local scale are time invariant, but that is not necessarily true for any law we haven't discovered yet. While on the local scale that feels so unlikely as for it to be basically considered "inviolable without extraordinary evidence", that is not necessarily the case in the community for laws at the cosmic scale.
