When hakari hits a jackpot during Restler Gambler his prize is that during the round, The 4 minutes and 11 seconds after hitting a jackpot infinite cursed energy will flow through him. Hakari never acquired reverse cursed technique But The infinite cursed energy overflowing in Hakari's body causes his body to reflexively perform reverse cursed technique In order to avoid damage. In another words..
In the 4 minutes and 11 seconds following a jackpot
Hakari is effectively.. Inmortal.