When doctors have, case after case, confirmed that the patient was dead in terms of all medical parameters....and the patients state that they were nevertheless alive and conscious, why should anyone doubt it?
For the reasons already given that you've ignored.
It may not be a scientifically proven conclusion, but we don't always wait for scientifically proven conclusions do we?
There is no such animal as "scientifically proven", there is only conjecture, hypothesis, theory, and evidence that supports or falsifies them.
The idea of an afterlife is lacking even a coherent scientific conjecture, let alone the hint of a smidgen of actual evidence.
We need not accept an after-life as an established fact just as we still don't accept parallel universes as an established fact....but it is definitely a possibility given the evidence.
There is no evidence of an afterlife.
The idea that Consciousness is independent of the body is a well established idea is religious and spiritual fields.
So there are stories about it - in what way is that of any relevance?
So, hearing and seeing while being outside the body is nothing new.
In fiction.
NDE's are evidence of just that.
No they are not, for all the reasons given that you've ignored.