This is Richard Joseph's plan, correct?
I think he's one of the best surgeons I've ever seen (just based off his website -- have no experience with him).
That planning does look primitive. Maybe have that plan run by a surgeon who uses more advanced software, or just get a second consult.
The occlusal plane is INCREASED via CLOCKWISE rotation whereas a better doctor could have DECREASED the OP via CCW posterior downgraft and achieved more 'horizontally' oriented maxilla advancement and in turn could have achieved more lower jaw advancement that can be had with an OP decrease when an OP increase is not really 'needed' to maximize aesthetics.
Since he has a short lower third, CW rotation isn't uncalled for. If you CCW rotate such a short lower third you could wind up with a Popeye look.
It's somewhat of a tough case because CCW rotation will likely look bad (too short), and CW rotation isn't going to address occlusal angle. It looks like his thought process is to move it CW to address the short lower third, then use the genio (-1.1mm) to reduce any unwanted length that creates. It's not a bad idea, IMO, but I am biased against CCW rotation on short faces.
I think a second opinion from a surgeon is in order. Maybe you can setup and email consult with Gunson, but keep in mind he likes heavy rotation. Relle might be a better fit for this case. See if you can email consult him.