His camber difference is not going to cause this problem. Camber pulls to the more positive number (bigger), Caster to the less. If you notice the right side changed from before to after. I can guarantee the guy who did the alignment couldn't have changed it. Remember, solid axle not independent. We all know what we have to do to change camber on these axles.
Suspension height will have no effect on camber either. Lifting will move the trailing arms dropping caster and pulling on the drag link, moving toe to one side. neither of these will cause a pull. If one side saggs on a solid axle, it "may" cause a slight drift to one side due to all the extra weight on that tire. It wont change camber on a solid axle. I play with balance scales. I have had a couple of hundred pounds extra on the driver side, climb in, add my two hundred and not cause a pull. Slight sag wont be that much. You should see the weight shift adding fuel.
Personally, I think the camber change is due to the alignment head moving due to not being secured properly. Some of the mounts are a pain to get tight.
One clue was he said when he rotated tires it got worse. All tires same size (new/old), pressure, damaged cording due to low pressure and rocks. Vehicle will pull to smallest tire.
Something dragging, tires, driver side shorter than passenger side due to adjustable arms incorrect, bushing issue, Rear housing bent or out of align due to adjustable arms or bushings.
Unfortunately, there's things that some of us check automatically and we forget to mention them. That's the biggest problem with advising on forums.