The reason the ship sank so quickly is simple. In the original design, the king's shipbuilders gave it one deck of guns. King Adolphus insisted on a second deck being added. Nobody dared contradict the king, so it was done. Which, of course, made the ship top-heavy.
What an idiot.
The link and the article are both from the official museum website. So it's safe to assume it's "Vasa",