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I agree, this seems like a hell of a jump in thinking to me. What's most frustrating is that the person asked to comment, who undoubtedly knows more than I (and ever possibly could know), isn't asked to expand when he states "there are other explanations for the variations seen in the bones found in Sima and these have to be addressed fully" - surely they could have asked him to give a brief summary of those explanations in layman's terms?
This hypothesis I find extremely implausible:
https://www.theguardian.com/science/2020/dec/20/early-humans-may-have-survived-the-harsh-winters-by-hibernating
I can well imagine that in order to get through the winter some people may have adopted the strategy of not leaving their caves at all, and instead to rely on (presumably inadequate) provisions, but I doubt very much that humans are/were capable of hibernating. Happy to be proven wrong.