Maybe... or maybe it only makes the obscured id accessible.
For unique identification they'd need to use the IMEI since multiple devices could share the same email/AppleID account, so in theory they could just store the obscured email ID + a hash of the full ID.
Getting info on this, or anything complex Apple related really is a treasure hunt. The fly-shit to pepper ratio of Apple information via searching on the net is about 5 times that of Windows stuff.
Luckily I DO know someone who works in Apple. In the Level3 support.
So perhaps I can get him to look for me.
We shall see. And I shall report back.