Sorry, that's not true. I live in temperatures well below -15C and I'm still alive. I go outside all the time in temperatures colder than that.
Going out sledding, skating, cross country skiing, walking....sometimes for hours.....no breathing protection (what is that, anyway? A gas mask???) seriously, I would suggest the man in that article had a pre-existing condition of some kind. People are outside in temps much colder than that and survive with no I'll effects. We were out in -52C weather one night, a couple years ago, as we watched the garage burn down. Firefighters and EMS checked us all for smoke inhalation, but there were no worries about cold air inhalation.
Maybe if your exposed for a long time your body takes awhile too cool down
LOLOL. Sorry, Charlie, but many parts of the world are as cold as -15 C (5 F) quite often. Nobody dies instantly.
News story. I've experienced temperature colder than that many times and I'm still alive.