Thank you for posting this. It's exactly what I figured President Trump meant as he spoke. Similar to inserting a tube into the lungs to perform a biopsy, only one set up to direct UV light. As soon as the reporter asked the President if he was suggesting injecting household disinfectants, I looked over at the wife and asked, "did he just ask President Trump about injecting bleach and isopropyl alcohol? (if memory serves correct, these were the 2 examples he used). She just rolled her eyes at the stupidity of the question.
The President may have also been thinking of procedures like radioactive seed implants or proton therapy, but obviously tailored to combat the virus.