This is wild
I used to snowboard similar terrain back in the day. Snow was ridiculously deep. Falling in a tree well was the most feared scenario.
I had a few encounters getting stuck/buried, snow can be so heavy its really difficult to get out.
SPOILER: the vid does not actually show him getting out, just mostly
What were the odds that no one would have found him? I think high. The patrols are supposed to do sweeps at the end of the day but there is so much to cover. A miracle this dude spotted him.