I haven't read the book in question, but I do have some experience with tarot reversals. Often, beginners can be overwhelmed by the idea of reversals, but it's important to keep in mind that the meaning of a card does not change when it is reversed. What does change is the emphasis of the message. Reversals can be interpreted as something that was previously inhibited now being expressed, so that in itself is a useful tool for deeper tarot exploration. There are some decks that include a separate set of images for reversed cards, and that can be helpful when it comes to interpreting the simple meaning of the card. However, in my opinion, it can be more useful to pay attention to how the reversal of a card applies to the overall reading.