Take his advice with a grain... or perhaps a quarry's worth of salt. This guy has written plenty of books and articles about the "agile" dogma, but most crucially, nothing about any of the software that he wrote. These days, it's even more obvious as the contents of this page feel like something an LLM could've generated.

If you want a "software architecture guide", you'd be better off examining software written by the likes of Linus Torvalds, Richard Stallman, Brian Kernighan, Dennis Ritchie, etc.