That book has parallels to "Draw the rest of the horse" - it's an awesome book, but the author definitely doesn't do a great job with the latter half, where he assumes that you not only understood the first part but also committed components to memory, so the rest of what he is saying can fit into your working memory and make sense.

Have to admit I struggled with the latter half, mainly because I didn't quite memorize the first half even though "I get it".

I do like the "teach it to me like I am 5" approach. People try to gloss over the basics nowadays like it's not complex enough intrinsically.