Haven't see that course (yet) but I think Dave's course is a must-buy - you won't regret it
Keep in mind that Elixir is Dave's main language now and possibly for the foreseeable future. He's written a book, teaches a university course on functional programming, speaks at conferences, is active within the community and, I'm sure, loves hacking with Elixir in his spare time. In other words he's not just an expert but extremely passionate about it.
He can provide an insight that few others can imo - and this is certainly how I feel about this course and I haven't even finished it yet!
Everyone interested in Elixir needs to do this course Imo It's the best online course I have ever done, partly because it introduces you to new (or different/modern) ways of development.