What is wrong with this users feed

I'm trying to find out what's wrong with my customers feed and I cannot.

Does anyone know what's happening here?

This is their blog,

http://whatsyoexcuse.com/

This is the feedburenr I created for them

http://feeds.feedburner.com/WhatsYoExcuseBeRss

This is their own feeburner,

http://feeds.feedburner.com/whatsyoexcuse/uri

But it's not updating what is wrong?

 

Heya, I think that the it takes about 30 minutes for the feedburner feed to refresh.