Hi JasT,
The technical answer is 'yes' Aruba Tags could be heard by nearby AP or from Aruba or other vendor.
With the arrival of AOS 8.4+, there is an IoT feed that gather Aruba and non Aruba BLE signals and allow 3rd party apps to read this IoT feed and use the related datas.
Another possible solution is to use a BLE enable device to scan nearby BLE signals and find out wich is belong to Aruba tags and send it to the cloud or where ever you want it...
Briefly, there is a lot's of use cases and scenarios... a lots of them do require a good analysis and a bunch of R&D...
Did you're client already have this apps or he want to hire someone to build it ?
Simon Rousseau
RIOH inc.