It's a nice enough guide but its default set up is something 97.30133% (recurring, of course) users aren't trying to do with a VPN - reach a home computer from their server. What most people want is to shovel all their client's traffic through the server. This is also described as a sort of afterthought, but I think for most people, it's the thing they're trying to accomplish when they want to set up a VPN.
