I wish pictures of the device in use were included. I’m having a hard time picturing how you use this.
The author appears to have posted it on Reddit and took questions / suggestions. There’s also a GitHub repo.
https://www.reddit.com/r/programming/comments/6e0m7p/full_free_book_annotated_algorithms_in_python/
I went back to school in my 30s and here’s my advice: only do it for the love of learning. Do NOT do it if you think having a degree will make you more desirable to employers. If you’re worried about breaking a tie with another candidate, break the tie by spending n-years working your ass off on your own for free.