the uniform size suggests each hole contained some device or container, whether wine, food, both. Either storage or factory as in wine. Baskets and maize suggestive of corn storage or corn booze
[0] https://en.wikipedia.org/wiki/Chicha
I did find another recent paper that suggests that the site was part of an Inca tribute collection system where everyone's tributes would be tallied. It is a very interesting paper and offers another plausible use case for the site in the context of what they have already found in the area. [1]
[1] https://www.researchgate.net/publication/300501765_The_Stran...
Perhaps tributes were paid in grain, or liquid products. Near the end of the paper they note that:
>In either regard, the line of holes at Monte Sierpe would have provided an ideal place to deposit tribute, where it could be easily recorded by the accountants of the Inca state (quipucamayoc) on site and then transported to Tambo Colorado or wherever the Inca authorities desired.
This valley was an important valley along the ancient Inca road so it makes sense that they would need a place to store things for distribution or to accumulate them for tributes.