Even if you understand the mechanics of the tech, do you know what it is doing to the persons mind that it is being used on? A person has to learn from scientology what the tech is curing them of before they can have the tech used on them. It has nothing to do with endorsing scientology it is the assumption that scientology understands the human mind, understands that it is needs repair and has the tools to repair it. scientology is used to bring you to the point that the tech is the method of verifying the tech.
What I experience justifies my experience.
What is true for me is true.
With that sort of thinking a person can be completely delusional and convince themselves what they believe is true.