Agreed. If I was teaching QM I would put the book on the textbook list.
I note that the Notebooks linked to the PDF are "licensed under a Creative Commons Attribution-ShareAlike 4.0 International License."
Although PDF looks very nice when printed out, I think that a course/book with embedded Notebooks would work best published to the (Wolfram) Cloud. Examples already there include Wolfram’s EIWL—including the he Active Cloud Version—and Wolfram-U courses. At the risk of being accused of self-promotion, here are two of my lectures from the 2018 Wolfram Summer School: