There's no scientific or medical basis for this I'm afraid. You don't hear the many, many stories of sad elderly people who die from infections living in their own filth every day, but one bizarre 94 year old dude gets a clickbait article made and has people thinking its time to reinvent the wheel. I work in the medical field and have seen much.
He was however, probably circling the drain when others intervened.
Just because someone is gravely ill, and you give them medicine, it doesn't mean the medicine is bad.