If you look in the page source, you will find:
<head profile="http://www.w3.org/1999/xhtml/vocab"> .... <link rel="alternate" type="application/rss+xml" title="Stratfor RSS" href="http://www.stratfor.com/rss.xml" /> ....
And I believe Google Reader uses a different user agent which is not blocked by the site
http://www.useragentstring.com/pages/Feed%20Readerlist/
http://support.google.com/webmasters/bin/answer.py?hl=en&answer=178852#often
I think it's an oversight of the page admin or a bug in drupal (website engine). That RSS feed should probably not be readable by google either.