Yes , but that angle away from the tail light housing is across the rear , side to side , not vertically , front to back . If the tail panel were vertical , the would be a huge lip at the top that goes out to meet the trunk lid , with the slope at the rear of the quarter panel .
Ok , look at this another way , if you straighten up the rear of the quarter panels on your model , at what angle will it be ? If you look at the bare quarter panel and use the bottom behind the door opening as a level horizontal line , then 90 degree up at the end , that's the angle of the tail panel , recessed in a little , but parallel with the quarter panel , of course that's assuming the photo is relatively square and straight .