It falls into the "shit that will bite you in the ass one day" category. It's about engineering quality, and it goes all the way down to the stuff we don't see.

Given Digg's history, it's a bit of a red flag. However, it all depends on how this technical debt is managed. If this is an alpha release under the heading "release early, release often" and the tech debt is known, there's nothing alarming about it. But if this is truly considered a final product than it makes you question how capable these people are to revive Digg.

Either way, some of these issues suggest simply a lack of skill/knowledge rather than deliberate tech debt. That's not a good sign.