Interesting, but since the study was primarily a tag along survey to detecting COVID, I wonder if they controlled for folks who were on SSRI’s, and if the distribution of participants was across the equator, or primarily in areas of the world that experienced summer during the survey period (March-Oct, 2020).

It’s known that SSRI’s contribute to a heat intolerance that is typically more noticeable during summer months. It’s described as feeling warmer, and is accompanied (sometimes) by decreased production of sweat.
Heat Intolerance and Psychiatric Medications - Psychology Today

That’s not to say there may be some (or a lot, even) merit to this study, but I’m curious about those two issues - if they had been controlled for.