I checked how much the pinion angle changed with 2" of travel up and down. Even with 1" of up and down travel, the angle will still change, but not as much as this.
These bars are aprox 20" long, and I was told that this is a drawing of a SW 4-link. I usually have 2-4" longer bars in my own 4-link drawings.
IC is 45" and lower bar is 3° down, just as an example.