'The problem with courses like the one the OP took is not that they offer bad advice, but they get people thinking about what they can sell instead of a) what problems they can solve and b) what problems they have the authority to solve.'
This has nothing to do with what the course teaches, but with the perceptions of the students during their time in the course.
I haven't analyzed the OP's business success, so I can't say whether or not I'd feel comfortable taking her advice, but I can tell you that were I to buy something like this, I would expect that it should come from someone with a good reputation and a volume of experience in the field (authority is a function of this).
I'm not damning the course or the OP at all, merely stating an observation based on my own experiences in the field of info-products.