I think the point of that post -- which I do not doubt was genuine -- was that health care systems that are already close to capacity (i.e. not enough intensive care units, etc.) are not ready for this virus. While some countries might be able to handle a limited number of cases fine, if too many hit at once, a lot of people will die. So the best we can do is try to slow it down via extreme cleanliness, social distancing, or whatever until warmer weather and, eventually, a vaccine come.
Remember, they were telling jokes in northern Italy (I have friends there) just a week or two ag