The GDC clip is basically him talking on others people work completely unrelated to what he's supposed to sell. High five!
Matt Parkin did another nice tutorial, talking about the production and the use of floor materials.
So this a very useful Substance Designer 6 guide, explaining how to make full procedural high-quality floor tiles in an understandable manner.
Matt has been running Polygon Piligrimage for quite some time. He published a lot of very cool tutorials on a variety of topics, covering Unreal Engine 4, Substance Designer and other important tools. If you want to learn more about it, go to the official website!