Don’t forget that this book is for people who already know JavaScript well. It doesn’t try to explain the basics. This book does, though: https://exploringjs.com/impatient-js/
Sure, but as an expert, explanations that holds up for everyone are always preferred no matter what level of book I'm reading, compared to an explanation that makes sense "if you already how it works". In both cases linked, the text feels incomplete or even just "wrong, were it not for the fact that I know what you actually meant".