Let me get this straight, you guys believe he could possibly die, but just happens to still be alive and be the oldest person on earth by now (I think), and just happens to be hiding where nobody can find him?
I know your point is that it’s only kefira if they believe he CAN’T die due to divinity, but at what point is the proof just in the pudding? Will it still not be kefira on his 200th “birthday?” Is it not common sense that he would be dead by now unless you believe something divine is going on?
If not, can we get a concrete date/year at which it becomes OK for us to say it’s kefira to believe he’s still alive? His 150th birthday? His 170th birthday? There has to be a cut-off.