If that client has been on the Aruba system and then roamed to a rogue device, which is fairly common in a corporate environment, the fingerprint information will be shown. Otherwise, there will be no fingerprint information. Notice it says "selecting a linked device", which means that the device has been on the Aruba System and has had the opportunity to be fingerprinted.
Only the manfacturer of the Rogue AP will be seen, NOT the manufacturer of the client device. I misspoke.