Blog not showing posts downloaded from its RSS feed.

I found what I think to be a really nice blog post about security in phpBB (Injection Vulnerabilities; http://www.phpbb.com/blog/2009/02/12/injection-vulnerabilities/), and how things should be handled in Google Reader today, and I visit the blog (which is the feed it came from) but it wasn't there. Was that post deleted, or is this a legit bug?