Yak shaving must be SV slang or something because I've been doing this nearly two decades and I literally never heard that term before... and the rhyme/picture was not helpful in teaching me what yak shaving is.

However, when I Googled the term I understood it.

A reader may learn a few software terms but I don't think this book would teach anyone, child or adult, a fundamental understanding of programming; which is what I would look for in a children's book. It also significantly narrows your market to only people who already know how to program.