PaulP: "No such thing as proof in physics (proofs are for math)"

It depends on one's Philosophy of Mathematics, whether one thinks Mathematical Proofs somehow exist in a Mathematician's physical brain (or in the Universe).

Many Physicists do in fact accept Existence-Proofs. They believe the Sun and Mathematics co-exist. Existence can be called an Effective Proof. Similarly, Engineering is Applied Physics. The first instance of a novel engineering technology is called Proof-of-Concept; ergo, accepted as a Physical Proof.

You clearly are not arguing that QBO may not exist, for lack of any proof. You are arguing for the existence of Lunar Forcing.