It's very much about being comfortable offline. But the last two sections, "Surfing the Entire Internet with Your Digital Fortress" and "Using Your Digital Fortress to Communicate with Others", are about using alternative networks, and are short, easy reads (although they link to the author's other pages on the topics).
I tried but didn't make much progress reading this article. Possibly because the background color hurts my eyes. Or maybe because of the poor structure that suspiciously looks like a few walls of text glued together.
What I gathered was that the grand name is just describing a computer that isn't plugged into the Internet? But then I didn't figure out the why's and how's. Maybe someone can fill me in.