I would typically carry food, a loud whistle, a cell phone or two way radio, and something to make fire with. It would all fit in one pocket with room to spare.

There are a lot of missing details, but if he hit a rock and encountered no one else till being rescued, I would have to conclude he was well off the normal path, if not completely out of bounds. Most places I've been they do a patrol run down every trail accessed by the lifts at the end of the day at the very least, so if he was out of view/earshot of that then where else could he have been?

Maybe not all ski resorts are run the same, but then I wouldn't use one that wasn't as well run without taking more suitable precautions myself.

I still stand by my initial conclusion.