For wayfinding, there is as you suggest no dependency on Aruba WLAN or even WLAN in general. There needs to be internet connectivity from the device which even can be 3G/4G cellular.
Aruba WLAN infrastructure with APs that have built-in beacons:
1) allow you to use those beacons similar to battery (or USB) beacons
2) can be used for (battery) beacon management, and,
3) are a prerequisite for the Meridian Asset Tracking solution.
Beacon deployment and management can be done with the Aruba Beacons App (Apple IOS App), though that may need someone to go near the beacons periodically to get up-to-date information. Integrated beacon management in the AP infrastructure provides permanent management and monitoring of your beacons.
From your information, it looks you are good to go.