I wish there was examples in the article. I am just curious how other people break them down. I recently completed one for a client. My Google doc was about 100 pages made up of types of typography uses, colors, elements, modules, components, and templates variation.
I printed them out and stuck them on a wall to review and come up with a way to condense everything.
I agree, this is a good overview of the process but I'd like to see some more details or tips for actually doing the inventory, or analyzing it all after. The most collaborative/visual way for auditing that I like to use is printing everything out and then cutting up the design while discussing and sorting with my team. I'd be interested in seeing other, less wasteful, techniques.