That's correct, but it was a gradual change. By 2010, the audience had aged tremendously, so they needed a way to bring down the demos. So they adjusted to "smooth adult contemporary." It brought down the demos, but also the ratings. So a few years later, perhaps around 2013, they tweaked again to Urban AC. That solved both the age and ratings problem. It's been extremely successful since then.
As for WMJX, they need to watch out for aging demos. Because what we've seen is the softer the music, the older the demos. That's what killed The Breeze in Philadelphia. It also killed the smooth jazz format.