In my view, you answered your own question with the second sentence. Sysadmins and linux hackers are no doubt familiar with this stuff anyway and used to reading through sysops-style docs and wikis.
Many other developers, we assumed, would not be as familiar with ops at first, and would prefer more of a basic introduction that walks through the steps and explains things clearly.
You're correct, the audience is really just a matter of semantics. The reason we wrote this post, knowing that this is very basic stuff, is that we found that a lot of the tutorials we'd come across didn't cover the introductory process end-to-end.
You're just as surprised as we are to see it on the frontpage!
Im surprised to see this on the frontpage, it is less than basics in anything any hacker worth its name can do.