Like others have said, thank you for sharing your experience.
As you say any system that claims to be a system needs to be replicable otherwise it’s really a collection of tips, which are generally no great suprise.
I, like some others, have been suckered in by the promises of some courses at one time or another and so have developed a healthy skepticism to such promises.
Your article reminded me that I was not alone in this and that I wasn’t simply being “negative” in my skeptical considerations of many of the advertising rhetoric I read.
Alan /|\