The user is @se0 and he has a reputation of (0) which is worse than a new user who joins who gets a reputation (25)

It's because of his short comments. He's obviously a bot running around trying to comment and try and get paid for his comment on blog posts. Someone has created a bot to follow him, and vote him down until oblivion. So now when this bot writes a post, it's hidden.

To figure this out, all you had to do was go to the @se0 blog, click "comments" and look at the crappy comments he makes everywhere. It's a joke.