Yes, that tweet actually uses five shorten t.co links which only return the text not the url as the user have made link with texts not url! Normally t.co shortened url get expanded automatically in the Twitter since they introduce the TweetButton. In this case, the text that shortened using t.co showing here! I guess there is no validation practices are not in place in terms of shortening using t.co.
Check my reply here http://news.ycombinator.com/item?id=1604037 Simple as that!