The rear control arm has its 2 bushings at the front ... that makes it a trailing arm suspension. If, and only if, the 4 bushings are in a straight line then there would be zero camber change as the trim height changed.
But, looking at the photos, the outer bushings are farther forward. That would put the camber toward negative when the car sits lower. So the trim height does affect the camber.
In the service instructions for the ALC, the trim height is specified as the height under the rocker panel just in front of the rear wheel. This does not include the flange, just the flat bottom. For a 1997 LeSabre that is specified as 9 inches.