I now believe that this guy really was a demigod, as the BBc has passed on the following from korean media:
Even nature is mourning, the state-run Korean Central News Agency reported on Thursday. A snowstorm hit as Mr Kim died and ice on the volcanic Chon lake near his reported birthplace at Mount Paektu cracked, it said:
"so loud, it seemed to shake the Heavens and the Earth", and a mysterious glow was seen on a revered mountain top:
"Following the storm's sudden end at dawn on Tuesday, a message carved in rock - "Mount Paektu, holy mountain of revolution. Kim Jong-il" - glowed brightly, it said. It remained there until sunset."
So that must be right. Certainly has removed all my doubts. I mean, how else would that glowing message have appeared if not from the man himself? Eh? Ask yourself that.