The question is this: what did the people around Shanidar Z do when she died?

We know the skull was found in a specific position, associated with a cluster of other individuals, in sediment that shows signs of disturbance consistent with deliberate placement.

We know the surrounding sediment contains pollen concentrations from flowering plants in patterns consistent with deliberate deposition — though that consistency is disputed.

We know the cluster was used repeatedly over an extended period, suggesting that the location held meaning for the community.

All of this is consistent with a community that did something specific when one of its members died.