> There's one paper from 2020 suggesting that Neanderthals may have torpor (there's some evidence in bone growth patterns suggesting that they basically just... stopped during winters).

Do you have a link for that. It would be fascinating if true and would easily explain how they were out competed to Homo Sapiens.

There is just one warm-blooded Primate, the Lemur, which experiences torpor. So there is precedent within the order taxon.