It's a shame you are so literal-minded, tiny.
It’s not being ‘literal’, most things aren’t black and white, and any scientists worth their salt will accept that new evidence can absolutely change what we thought of as ‘fact’ previously.
However there’s also no point in pondering the endless ‘what ifs’ without any conclusion either. If current scientific and logical knowledge points to NDEs being our brains projecting images, rather than an actual afterlife, that is realistically the closest thing to ‘fact’ in the matter.
That of course shouldn’t mean you can’t have a personal belief to the contrary, however if you want it to be taken as seriously as the scientific side, it’s up to the person with the ‘belief’ to show solid evidence of their own hypothesis. We can all have our ‘beliefs’, however no one is under any obligation to see them as realistic, unless the evidence is there.