Yeah, that post was for Robin's self-published book. This link is a paid interactive course based on the same material.

(FWIW, Max Stoiber did the same thing with his React/Redux/Immutable tutorial [0], and I'm actually hoping to turn my own "Practical Redux" tutorial series [1] into an Educative.io course in the near future as well.)

[0] https://www.educative.io/collection/5642398931615744/5741031...

[1] http://blog.isquaredsoftware.com/series/practical-redux/