Yes sunlight kills the virus on surfaces that get sunlight directly, which most of the cells of the human body infected with Covid-19 do not.
The author’s premise is like saying take all the shit in your house and set it out on the lawn during mid day; that will “disinfect” all your stuff.
Forget that you will not wear gloves most of the time when you go out, and will forget to wash your hands as soon as you come home, and will proceed to touch all your shit that was brought in from the lawn, and start depositing on it all the microbes your hands picked up.
You cannot turn your body inside out, take a sun bath and kill whatever “bugs” have invaded your body.
Sunlight may kill Covid-19 but sunlight is not going to kill a Covid-19 epidemic. MOST Covid-19 infecting people never sees sunlight.
Sunlight produces vitamin D which is inside the body. A Freeper’s post claimed there’s been no severe cases that had adequate vitamin D. And then the vast majority of deaths — maybe close to all — are unhealthy, fat, diabetic, etc. The death rate for children under 4 is almost 0 and nearly all show no symptoms when they get it. This is a VERY WEAK VIRUS.