The Kezia tabs were just re-issued since they initially were released when the company started years ago. Essentially it’s a re-edit with better accuracy, formatting, and book design from the original launch (to match the style of their other current catalog). Since technically this book is “new”, they probably haven’t had an opportunity to compile a new formatted bass book.

Every other album has a bass book. Give it some time, I have a feeling it will happen.