It can provide great benefit, however it may work. Just having somebody standing by you trying to help, and taking great interest in you, may be very powerful. And in today’s medical model, experiencing the sustained attention and interest of a medical professional has been all but lost. Don’t knock it if you haven’t tried it.
At the salary advertised it is very cheap. Many medical treatments are way costlier and have a less than 50% efficacy rate, with side effects into the bargain that are often nearly as bad as the illness.
I would be happy if NHS were finding this, though it sounds like it is a charity.