"Replying to one's own post is generally considered strange behavior... "
Not really, newbies don't always realize there's an EDIT button, or how to use it.
Strange, is that those first five posts are dated 2001?!
If those guys haven't made any other posts in five years, yeah, I'd call the posts a bombing run. (Forumspeak for someone dropping in from the sky then leaving again and leaving something behind.)