Eh, he's gone rogue. I'm sure being idle and waiting for news from LE is driving him crazy. He's desperate. His theory does not make sense to me but he's not clear headed right now, IMO. An abduction theory is giving him hope because the alternative he's not ready to face right now.
He's not speaking from a place of authority, because he doesn't have it but he is a panicked husband.
At some point, LE and probably along with the a SAR Command Lead, will sit him down and tell him they are moving into a recovery mission, based on many factors. They will continue to search but then the official search will be suspended until new and credible information comes forward, then they will search again. It's heartbreaking when it gets to that point but I don't believe they are there yet and will continue to search. They must have credible information to believe that was her PLS.