I'm not sure, but probably yes. I would think that any outbound link that has no target would be a broken link. That's standard terminology.
If you post this question on the help forum, you'll probably get an answer: http://hubpages.com/forum/2
The bad links warning should highlight the problematic link in yellow for you.
You could also put an eBay link up, let it go outdated, and see if you get a broken link message. Simply create a hub with no other links, to be sure.