It’s Debka. They declare folks dead at least twice a week. NO ONE else is reporting it
Debka has previously reported rumors of his death - apparently just to screw with the Iranians. Maybe they can fake some Iranian into moving against another.
I did see another report that he had entered the hospital, and he is widely known to have cancer.
This rumor may be celebrating the Jewish holiday of Purim, which commemorates a failed historical Persian plot against the Jews. Him going into the hospital adds credibility.