I guess I read the original question as “are NDE a proof of the afterlife”
And my answer is “no because they didn’t actually stay dead”
I do believe in an afterlife, like the Catholic Church teaches, but NDE neither proves nor disproves it to me.
I really think NDE is a biological phenomenon brought on by decreasing oxygen to the brain.
When the book “Life After Life” was written, NDE was unknown to the public, and NDE reporters all thought they were the only ones who had experienced it. Their experiences were shockingly similar. The testimonies also tended to be pretty short.
As time went on, it seems like NDE reports became more lengthy and elaborated . I really don’t know why, but I don’t rule out the possibility of embellishment.
Of course I could be 100% wrong

!
Visions are a different phenomenon, and I do believe that Our Lord can meet us where we are and work with us where we are to guide us to Truth.
Whatever an NDE actually
is, it is a very dramatic and moving experience to the individual, and if it has a positive effect on their life, that’s wonderful. Watching a beautiful sunset is an explainable phenomenon, but it’s still lovely and calming and soothing to the soul.