Regardless of "professional" roles (e.g., neurosurgeon), one of the commonest mistakes we humans make is using our emotional experiences as "evidence" of what actually exists in "another" realm. Born-again Christians do it every day (e.g., "the Lord has personally revealed himself to me. I know he is true and real...etc. etc. ). Dime a dozen stuff.
I would expect, though, any "professional" worth their training and alleged expertise would at least temper their conclusions about their "powerful" "inner' experiences with a healthy dollop of educated caution - especially given the delirious ease with which humans in general are often under the spell of their emotional reasoning (e.g., wishful thinking, wanting to believe in the afterlife, etc).
There's nothing whatsoever wrong with beliefs and convictions in spiritual matters, but to draw upon one's claimed expertise in one area (e.g. neurosurgery) to make confident assertions about another area (NDEs) is pretty nigh unforgivable. It is simply one of the latest forms of "The Lord has spoken to me..."
In any other context we would declare such a man a narcissistic attention-seeker hellbent on promotion of his cherished beliefs with a ready eye to the mighty dollar: He already has a drooling readership of Christians willing to pay for his emerging "best seller".
My envy at the ballooning bank account almost has me stifling my cynical yawns.