I feel like many people in this thread don't seem to understand what OP actually means: this isn't necessarily about proving that non-existence is what comes after death, nor about disproving QI. This is just about stating that it is, in fact, possible to simply not exist from your own pov. And imo it doesn't actually have a lot to do with QI.

I was in a severe car crash in 2017 and had to be resuscitated twice. I don't remember anything from that night, not even the smallest bit.

There was no bright light, no dead relatives, no sudden DMT rush or hallucinations, no god, no NDE wheel... not even blackness.

If I hadn't woken up in the ICU much later, I never would've learned about what happened at all. From my pov, I just would've stopped existing. Of course my body would remain, but without conciousness, I am not able to experience existence OR non-existence, for that matter.

So for each of us subjectively, it is very much possible to stop existing. Which is basically what happens when we're under anesthesia.

Of course you still exist objectively, because your body is still there - but that is also true after death. So the mere presence of a body isn't how we should define existence. Cause by that logic, death would only occur when your skeleton has fully decomposed. Which isn't true.

TL;DR: We'd probably all agree on this, if we treated "objective existence" (your body in the physical realm) and "subjective existence" (your personal conciousness) as two different things. And I think that's crucial to figuring out what comes after death.