Another benefit besides those you listed is teamwork. Playing together in a band, there is no way to "game the system". Everyone needs to learn their part to make the overall piece enjoyable. It proved to me at an early age that people can come together to create something greater than themselves.

From the original study: "-evidence indicates that engagement in music has no impact on people’s non-music cognitive skills".

My intuition says the evidence must not be comprehensive enough then.