The assumption is that that question can be resolved through reliance on physical evidence alone.
Sure, there is a deep relation between brain state and mental state (although one shouldn't forget there are many cases where the nature of the relation isn't clear at all, like terminal lucidity or savant abilities after brain damage).
If you destroy certain regions you absolutely won't be able to physically see, hear etc...
The real question is whether that's because experience relies directly on an individual's brain, or due to an temporary entanglement of the mind and the brain - which limits the mind of a brain-damaged being
as long as the entanglement remains.
I don't think it's that far-fetched to suggest that if that entanglement can be broken in any way, it's through death.
People with severe brain dysfunction can have extraordinarily vivd experiences during a NDE, just not of this world. Blind people even report
being able to see.
None of this can be proven through physical evidence. We only have our own experience and reports of others.
That's simply the nature of experience. You can't directly measure it.