You are one hundred percent correct to question all therapies and I highly suggest you search the internet and you will find thousands of articles that can explain it very well.
The reason I am posting this therapy is just like you said, because most know nothing of it. In fact people are placing negative votes on the therapy without knowledge of the wonders. I could tell you all day long how good it is, I have done it 5 times myself and went with problems of a disc, which I no longer have that problem. It took several sessions though not solved in one session.
I admire anyone who questions, and I wonder about those who don't.