He was hypothermia and heart only stopped after reaching hospital

No white lights or stoplights when he woke up!!!

He wasn't dead.
He was mostly dead, there's a big difference between mostly dead and all dead.

Hiker alive and well after 'dying' for 45 minutes

[bbc.com]

And down, down, down, through a tunnel of honey I spun. Around and around, until out I plopped, betwixt matted hairy pillars. And I looked up. And I saw the face of BEAR, the Almighty. And BEAR looked down at me, and said: '" It is not your time yet! You are not fully digestable. I must chew you up, and feed on your flesh again, before expelling you through the tunnel of heavenly pooh!".

Ha, funny. Got it.
In reality, he was fortunate to go to a facility with ECMO capability. Most ERs don't have that. @Mofo1953-while the brain doesn't need as much oxygen with colder body temperature (see Advanced Cardiac Life Support-Targeted Temperature Management), when way too cold the heart can go into abnormal rhythms that don't pump blood. I really applaud the team that cared for him and got him off the mountain.

If he was in freezing cold weather, your brain doesn't suffer much for lack of oxygen.

He didn't die if they 'brought him back'

His heart was beating until they got him to the hospital. His heart stopped then, and they kept him alive (he didn't die) by oxygenating his blood and continuing to pump it while they played with his heart.

Way too many persons who have had CPR then have brain damage. At my age, I have a standing order of no CPR. The possibility of living with brain damage is more frightening to me than dying.
[medlineplus.gov]

That figures

I think I would punch the doctor in the nose and scream “ now I have to die twice!”

That's FrankenSTEEN

There was a case several years ago where a man was frozen for several hours and revived. Seems the key is to be 'quick frozen' and thawed slowly.

And Dr. Frankenstein shouted loudly, " It's ALIVE, It's ALIVE." LOL

I will be waiting for his NDE story.