What a ridiculous article, full of baseless speculation. At least it has the decency to mention the obvious explanation, in between all the nonsense:

Akaash Maharaj, senior fellow at the University of Toronto’s Munk School of Public Policy, says it’s also possible Khamenei is simply in hiding, given the dangers of offering even a small clue regarding his whereabouts to U.S. and Israeli forces.

“Every time a member of his regime lifts his head above the parapet, it has a bad habit of being blown off by the Americans or the Israelis," he said. "And even a highly controlled video would provide some clues to the person’s location and his condition.”