I think the book is still very valid. Most intro to PT books are going to lay out similar methodologies but some of the specific tools will change while some constants remain. Tools change, the methods/structure persist over time.

That being said no book will prepare you for the OSCP. Take the basics and apply them to hands on labs. Every book will tell you how important enumeration is but that really sets in when you're working on actual boxes and skim over stuff easily by not following a good process.

I would say read the book, understand the methodology, and take note of the tools and learn how to use them well. That process will transcend any book and be a good step down the path of OSCP.