My first cruise will be on the Koningsdam mid August, and so I've been researching this one ship extensively. The Culinary Arts Center is now the Club Orange exclusive dining area. In the recent daily schedules I've seen, no mention of Earth in Concert (or any string instruments actually).
Most of the activities are, 1. pickle ball, 2. beginner classes (such as knitting or water color painting), 3. gambling (casino/bingo), 4. shopping, 5. EXC presentations (getting to know whatever ports you are headed to. For me, these are all going to be Alaska-related topics such as the Iditarod).
I'm with ya. A lot of the things on the website and even the Cruise Critic official editor review are simply outdated and misleading.