The GDC clip is basically him talking on others people work completely unrelated to what he's supposed to sell. High five!
William Vaughan has recently released his Pushing Points Topology Workbook which is a 125-page guide to the basics of SubD topology. The digital book comes with 60+ exercises, tons of tips and tricks, and useful techniques to help you get started.
There are over sixty exercises packed with loads of tips, tricks, and techniques designed to teach you how to manage the topology of your meshes.
Throughout the book, you will also find many images of wireframe rendered assets and their topology that you can study for reference.
This book doesn’t show you how to build a car, character or creature. Instead, it teaches you the foundation of SubD topology, so you can construct ANY SubD asset with clean polygon flow.
Download the Topology Workbook today.
You can find more details on the book here.