Nonsense.Solo is a two day "event" in which you must have demonstrable skills to a level that shows your solo diver credentials. There's no time to learn and perfect significant new skills. Given that diving solo relies upon your skills, that means you've already got them as a pre-requisite to the course.
Thus it's a workshop, not a course.
Nonsense.Good to know, I wasn't aware of the structure or requirements of the course. So it's more of a "bring your skills with you, we'll certify that you're okay to dive solo, that you know the standards and procedures, and we'll give you a card."
Solo is a real course, with real learning possible, and a real opportunity to not pass.
Any good solo instructor can always teach something new to even the most accomplished student, if they are willing to learn.