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I'm Vietnamese and I was born and still live in Canada. My body has adapted to the cold quite well and I prefer it over the summer heat. This makes me feel that ancestry is not a part of cold resistance.

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Regardless of your anecdotal experience, adaption to cold is certainly genetic to a large extent and the literature seems to support that hypothesis.

https://link.springer.com/article/10.1007/s00421-014-2962-2#...

I have fully adapted to climatized rooms at 21°C/70°F. My ancestors must have been pampered wimps then.

Your article looks like junk to me. At least from the abstract, there doesn't seem to have been any attempt to control for the environment (and climate) that the subjects grew up in.

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