Hmm. I wonder if the goat meat and fat were a type of pemmican. Which would certainly give the kind of dense energy needed for his mountain travels. As for speculating about his general eating habits, that is unwise.
We wouldn't make assumptions that a modern day mountaineer lived on dehydrated SpagBol wrapped in silver plastic, and Kendal Mint Cake, would we? They might be in his pack when he dies on the Matterhorn, but that tells us little about his daily life and food intake.