If you tweet that URL, you will see a View Summary link, and a summary card attached.
That page has cards markup included 5 times, with different descriptions. This is not necessary, only the first set of markup will be read by the validator and the cards crawler.
If you tweet http://intense-taiga-3703.herokuapp.com/entry/xiii-le-haka-lors-de-nouvelle-zelande-australie-junior-hd then you are linking to a page with no cards markup included, so there is no card attached to the tweet.
I will delete your other thread asking the same questions as there is no point in duplicating this discussion in the forum.