There rarely are many watchstanders on the bridge of any cruise ship. The reason is technology has eliminated the need. For example the largest cruise ship in the world - the Oasis Of The Seas - normally has two people on the bridge. It's all they need.
The Captain said they had to perform the sharp turn to avoid an undetected buoy. Why can't that be accepted as factual? Meanwhile we have a self-proclaimed navigational expert stirring the pot in his response to the news article, but oh, he was in the casino at the time they made the maneuver.