While I commend you on your diligent search of the forums (so few people bother - so thanks for that!), the post you've found is SO old now that the instructions it refers to no longer exist.
If believe there is support in ipodpatcher to find 3G ipods now - but only in the svn copy, not in the redistributable one we have linked in the manual at the moment. (Correct me if I'm wrong linuxstb!)
So you either have to check it out and compile it yourself, or wait just a bit longer (a week or so) untill it's ready for primetime.