All of this is wrong, it was revised and nah nep2 doesn't work this way
That's like saying being more dead than death should immortality type 5
Let me brief you up, being more nonexistent than nonexistence is just deeper Nep1, being beyond both nonexistence and existence is probably just nep3 or no nep at all, nep2 is somewhat not as graspable as you thought
The character must be, neither nonexistent nor existent, that's why we give certain special form of nonduality to it, to explain it better for the mass, its like how you are neither alive nor dead rather than being more dead than dead or above death and life (this just gives you base level resistance to life manip and death manipulation), you get it now don't you?, existing in a state that is neither existing nor non-existing is what gives you Nep2 and by that you also gain nonduality by default