And you're not jailbroken? (Apparently there is a Cydia hack which unlocks the old behavior.)
Interesting, that makes it sound like Apple reversed their policy.
As for the USB ID of your iPad Mini 4 -- the comments at the end declaring the device names are so the plugin maintainer knows which devices have been accounted for. The question mark is if he wasn't sure which model it was.
Are you not sure whether your iPad is the GSM version
