I really don't see a problem with this, unless there is something I am missing. This isn't going to be the cause and cure for everyone. Some people may have their symptom start in the immune system and this won't work. For others it can start in the brain. If the brain is sensitised (wired to release excess glutamate) to certain stimuli, that could lead to excitoxicity and inflammation. This is a "wiring", so it can be rewired (relearned). Obviously, once you open a can of worms it's not easy to get them back in, so there's no guarantee the inflammation will calm down even if the brain is desensitised. In fact, inflammation sensitises the brain, so there is a vicious circle going.
This is just my impression, I'm not a scientist.
If someone has a cure they can start with a pilot clinical trial.
No. At least in my country you would need (by law) any medical research approved, and a competent person (i.e. doctor) in charge. This costs money. The end result may be that the treatment is approved so patients can buy it. This is exactly where we are at now, except that only people who recognize themselves in the idea buy the treatment. Loads of more people (who would never have bought it normally, and whom it may not even work for) will buy it if it is backed by research. This would lead to lots of people wasting their money, and the sellers getting a lot richer.
Please remember that this woman had electromagnetic hypersensitivity (ie. imo nocebo-created symptoms). So what if it is placebo if the illness was nocebo? Patients get a better life at basically no risk (compared to the risk of supplements, medications, GET, etc).
Obviously they make money off this. Everyone needs money to eat.