I just asked "the Cat" (called Suzie and probably lives in the extra-dimensional world of Selsey here with me and my many probable lives and many probable wives in a state of supra-existence. The downside is many probable mother-in-laws, of course).
Suzie said that because of her disbelief in Mr Schrodinger, his existence is only a possibility. Therefore he may have possibly conjectured the theorum, but more probably may not have done so.
Therefore she and her Marmite sandwiches definitely exist.
You, on the other paw, may not.
Remember, the certainty of the probability theorum is uncertain.
PS as one or two of you may know, I have a slight background in astrophysics. Stu, would you be prepared to pay for my copy if I get a response from Stephen?