The death date on the tombstone was the date of the Oceanic crash; the party line is that he died when the plane went down, along with almost everyone else outside of the Oceanic Six. So he's either still alive on the island and everyone is pretending he and everyone else on the island died (for reasons that are yet to be explained), or he dies on the island sometime between now and when the Six get off.
I missed that hint, anything else indicating that Jin had a flashback?
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