Planning ahead, bulk processing, storing for later. Sounds less like primitive survival and more like logistics. Every time we dig deeper the gap between them and us gets smaller.
Primitive survival in places with winter requires storing rations for the winter months. Dried meat, fruit, seeds, and rendered fat are what it takes to survive winter.
It's possible to make potted meats which will store for a time at room temperature (for extra credit, ferment it like sausage) by covering them in fat. But they didn't have ceramics apparently, I don't know offhand if you could do it in something like an animal stomach. Of course, we put sausage into intestine casings... I dunno make sausages and dip them in fat?