Ahh, yes, I remember Lars Fält talking about this incident. It would be interesting to analyze it closer. Things like key actions and equipment.
Off the top of my head.
The mukluks: good footwear probably saved him.
Fire lighting skills and equipment.
Skills in making improvised toboggans and/or packframe
Small caliber rifle. Most game is small game, so a .22, or a combo would be ideal. If one uses a round with a little bit more kick than the .22 (.22 mag, .222 or so) one would have the capacity to take down anything smaller than a bull moose or a bear, assuming sensible shot placement.
Good mittens. More important than many think.
Navigation. Following a watercourse will normally lead to habitation. Crossing steep ridges or mountains is not the first choice.
Not giving up. Lars likes likes to emphazise that people who have a reason to make it back, loved ones or something they don't want to leave undone before they die have a better track record of surviving. Could be selection bias, of course.