“Suppose we hit the body with a tremendous ultraviolet or just very powerful light,”
You can do this to water. You can't do this to humans. It will burn skin, possibly cause cancer, and the UV light will not penetrate inside the body. If you had strong enough light to penetrate into the body, you may manage to kill the virus, but you'd be left with a smoking pile of ashes, not a human patient.
The statement shows complete ignorance of basic science. He doesn't need to be an expert in all fields of science, but he should learn how to keep his mouth shut on topics he is ignorant of. I suggest you do the same.
Your ignorance is showing once again.
Look into healight researched and studied by a team of doctors at Cedars-Sinai hospital in california. They have come up with a way to filter out UV-B and UV-C and use just part of the UV-A spectrum which they have proven they can use internally without damaging healthy cells but will destroy both germs and viruses. Plus UV has been used to treat an assortment of diseases for decades.
Do some non-political ideology research for a change.
https://www.woundcarecenters.org/article/wound-therapies/ultraviolet-light-therapy
https://www.cancerresearchuk.org/about-cancer/cancer-in-general/treatment/other/ultraviolet-light
https://www.leaf.tv/articles/medical-use-of-ultraviolet-lights/
https://www.hollywoodlanews.com/uv-light-kills-coronavirus/
https://www.healthline.com/health/psoriasis/phototherapy-treatment-options#Overview