We inherit knowledge from the previous generation, use it, modify it, and pass it to the next.

The accumulation of transmitted knowledge is one of the key factors that has allowed human populations to successfully occupy virtually every terrestrial environment on Earth.

If Neanderthals transmitted knowledge of the Shanidar Cave across generations for tens of thousands of years, that is evidence of exactly this kind of cultural accumulation and transmission.

It is the same process, at a very long time scale, that we recognize in human cultural continuity generally.

The burial cluster fits into this picture.