If someone is at death's door, and there is not much chance for recovery, why not try these things that he recommends? Who knows, it just may help. Even if it does only cause a placebo effect, I don't see any harm, as many illnesses can be cured faster by positive thinking.
Before all of the big time pharmaceutical companies sprang up, people used natural herbs, vitamins, and home remedies to help cure themselves, and I think that there are still benefits that can be gained by trying these natural remedies.