I haven’t seen the videos myself yet but I think he should be commended for putting together learning material. Perhaps you could send him some suggestions on how he can improve the course?
Maybe a different title may be better suited to it, something like “An introduction to Elixir for those who know other programming languages” perhaps?
I think it was pointed out in another thread that when doing videos you’ll always get some that really like what you do and some that don’t, but either way I’m sure that he would be interested in receiving feedback about the course.
Just a final note about this since you mention it, please don’t forget that the person who made this course is part of our community too - so while open and honest reviews are always good, please also be tactful and considerate 
