It is true that many burials were isolated interments in scattered localities, but other caves also contained large numbers of graves--Whitchers Cave… - Judith Sealy

In this area, people were able to choose from a long menu of foods including venison and the meat of other wild animals, berries, edible roots and corms, particularly of plants in the iris family, seafood including shellfish, fish, seabirds, stranded dolphins or whales, and much else. All these items have been identified in excavated food remains. It is, however, harder to know their relative importance.

Bone tissue accumulates over many years, so this was a long-term dietary pattern. People buried at Matjes River Rock Shelter, on the other hand, ate much more mixed diets, with more terrestrial food or low trophic level [low on the food chain] marine foods, such as shellfish.

There is an extensive literature on the use of ethnography in archaeology and the dangers of simplistic assumptions that past societies were necessarily like recent ones.