I am not saying this is too little. Rather, I am thinking it's too much, too much as misleading to some lay readers that American laws are so simple that everyone can "hoyo" on it.
No defense, but shame on the author to publish such a book, if he did receive some basic American legal education.
In short, the book is not professional, and less value can be proved only by setting out several common law rules that the author himself does not know much about it.