The author of the opinion pieces you cited is apparently relying on this study regarding cold deaths: https://www.thelancet.com/journals/lanplh/article/PIIS254

The author of the opinion pieces you cited is apparently relying on this study regarding cold deaths: https://www.thelancet.com/journals/lanplh/article/PIIS2542-5196(21)00081-4/fulltext https://www.thelancet.com/journals/lanplh/article/PIIS2542-5... But his interpretation is dubious at best because the study is not about climate change! The reduction in deaths attributed to cold or heat might not be connected to climate change at all, the study doesn't say anything about it. That's solely the author's interpretation. From the actual study (which is also pure speculation because their method doesn't provide this causality): "The results indicate that global warming might slightly reduce the net temperature-related deaths, although, in the long run, climate change is expected to increase mortality burden." He also doesn't provide a clear source for his claims on economic development, so I'm still sceptical.