I wouldn't offer a course without knowing it's worth it.
I have done one of the courses only, but because my technical level is high.
I am not an AA technician, I am an electronics specialist and I am dedicated to repair AA electronic boards and boilers. When I did the course I did not learn anything new because it is aimed at people with a medium-low level, but as a specialist, I must admit that the man explains himself very well and has a very good technical level.
If you read articles from his blog, you will get an idea of how he explains the technical concepts of electronic repair.