The Single Universe Theory and Collapsed Models Can Be Refuted

The only known explanation is that the multiverse did split or differentiate into two different groups. And these universes then interfered with each other in such a way that the photon is only detected at detecta two and never at detecta one. We conclude that the single universe theory and collapsed models can be refuted by this means. Once the experiment is over, it makes no sense to ask parlox, which mirror did you actually detect the photon at? Was it the mirror at the on the d path, or the mirror along the u path? Parlox won't be able to say, because the two versions of parlo, and indeed the whole two groups of universes, have bined