Hi! I'm the author. Happy to answer questions.
PS: Thanks for your work ! Watched your talk and it was a nice quick primer. Glad you turned it into a book with more detail.
Also: I'm not sure org-mode -> TeX was a great idea.
As a bonus, using pandoc to convert my org sources to markdown worked reasonably well.
Do you intend to complete this book at some indeterminate point in the future?
Is there anything that any of us can do to help make it happen?
Yessss! Utterly selfishly: things like 'Noise Protocol Matrix' or 'Nonce misuse resistance 101' are actually closer to your target than XOR diagrams that people can already find on wikipedia.