Some parts of the book will still be relevant, the core topics like spring dependancy injection, bean lifecycle, aspect oriented programming,
testing, model/view/controller, REST web services. Other old topics which were dropped for the newer certification, can just be ingored, technologies like spring remote method innovation,
SOAP web services for example.
In summary I'll use both books along with Spring Boot in action. And also the official documentation which is always very good.
Good luck.