The worrying thing is that if this is touted as a solution for all kinds of psychopathology then that likely means it is a placebo effect. Nothing cures everything.
Brain wave pattern refocusing (biofeedback) is fairly old hat. The older apparatus for this would simply emit a pleasant beep when the recommended state was achieved. Patients who used it reported feeling better. Are these new enhancements helpful? Let clinical tests ferret out the facts.
I know how you mean that but do you realize there is another correct interpretation? I assume you mean "There is nothing that cures everything." Then there is "Nothing (the absence of all things) cures everything (the presence of all things.)." The absence of "all things" cures the presence of "all things".
Oh, well. It's late.