Another reason you are seeing less cases and deaths in that part of the world is due to the lack of testing... I agree with you regarding the article published in the New Scientist Magazine last week, but in a recent article an disease expert said "It's unreasonable, I think, at this point to expect that the virus will quote-on-quote disappear during our summer months," said Dr. William Schaffner, an infectious disease specialist at Vanderbilt University in Tennessee, who was not part of the study. Still, "I think it might give us a little bit of hope," Schaffner said.
https://www.livescience.com/warmer-weather-slow-coronavirus-spread.html