For many years now the AAM 11.5 has been known to be under-filled from the factory; it was a topic even back in 2006 (13 years ago) when I bought my Dmax!
Generally these are robust units except for the "gov-lock" (aka gov-bomb) feature. As long as they are treated easily, they hold up fine. Wayne is not likely to abuse his, so it will be just fine.
The GM fluid is known as "grape juice" due to it's odd factory odor. The only thing this diff needs is any quality GL-5 lube with a friction modifier. GM has a statement out from long ago saying not to add FM to the lube, but that is because the GM already has FM in it, and adding "more" would be adverse to the unit's clutch pack. Despite it being called a "locker", it's actually just a glorified clutch-biased limited slip device. Because it has a clutch pack, it needs the FM or it will chatter badly upon an OCI.
Get any lube that has GL-5 approval; either choose one with FM or add in the supplement if needed. Fill it with 4 full quarts. No issues after that.
As for the UOA itself; it's fine. This is FF; lots of Fe expected. Now that the ring/pinion are broken in, the wear will be fine. Fill it and leave it alone for 50k miles (dino) or 100k miles (quality syn).