I just think that their idea of the app being "growth" may not exactly work out as planned. Radio Disney didn't work out as planned when they went online only. This was even when RD's major demographics were tech-friendly young people.
You're comparing two very different things. Radio Disney was a failed format, that assumed children wanted to hear linear style radio like their parents. The SiriusXM app gives users access to all Sirius channels (and more) on their device without need of satellite.