Sure, in the short-term and in certain regions. But your own linked Lancet paper states:
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.
Studies like these also don’t account for mortality resulting from wildfires, floods, droughts, crop failures and extreme weather, all of which are expected to increase in frequency with global warming.
But rather than cherry-picking locations, let’s look at a region that is directly relevant to Americans. Excess mortality due to climate change is accelerating in Central America. https://www.ifrc.org/press-release/deadly-heatwaves-central-america-35-times-more-likely-because-climate-change-and-four
Warming temps are not just directly killing people, but also causing crop failures and extreme weather, all of which contribute to the social instability that drug gangs take advantage of. https://www.thenation.com/article/environment/honduras-migration-climate-change/
The long-term solution to the refugee problem coming from the south is to mitigate climate change. Otherwise we are going to need a bigger army who is willing to shoot unarmed, starving refugees.