Yes 100%. Any update with new materials will be part of the downloadable files for anybody, who has got older version. 

To date(26.10.2023), there are 118 materials in the collection.

From my own experience after 2 years of daily work in the international office as an Archviz Architect in Blender. I think that in daily routine you don't want to have a "closed" Node Grouped Collection, where you can get access to only to a few components. You need to see the whole situation quickly and in most cases - change or create the direct component. For a faster and more understandable workflow. I would prefer to have my materials "open" without Group Node. When I wanted to learn to create materials, I didn't want to edit only specific properties, I wanted to see, change, and especially understand, what is going on. That´s why are this collection different from most of the libraries.