if the question is about accomplishing a curtailment, I don't think those are that cosmic. It doesn't mean a position is being cut, it means someone is asking to be released from an assignment/location early. I've seen others do this from OCONUS locations. It's just a request to curtail the length of the current assignment. So in his case, since that ADSC exceeded his UPT ADSC, he needs to curtail to be released.
ETA: the correct term in AFI 36-2110 is a "stabilized tour." Para 1.4 talks about waivers, suggest you start there.