Let's look at that citation.
The cited paper has nothing to do with the claims that baby bear is associating with it.
It's not a paper about spinal evolution in our hominin ancestors, it's a paper about back pain in modern human history.
Once again, large language models don't have underlying knowledge models, and in their current forms don't even understand the relations among documents.
Why anyone would think this makes for a good search engine is beyond me.