Fellow Form Members, the following comments are just my opinion. I am not a mechanic, just an enthusiast who has worked on many types of cars over the years, muscle-cars to exotics...and everything in between. If I am in error in any way, please correct me.
The bushing design certainly isn't the best. The inner and outer sleeves are joined by the rubber isolator part. The outer sleeve rotates as the suspension arm moves up and down, while the inner sleeve remains stationary. During suspension movement (up and down) the rubber isolator portion is twisting.
After new bushings have been pressed into the suspension arm, and the suspension arm is being installed back onto the vehicle, BEFORE torquing up the bolts, move the suspension into the "vehicle at rest" position, and then tighten everything up. Do not tighten things up with the suspension hanging. The "notches" should be lined up with the vehicle suspension in the "at rest" position (as if the vehicle is on the ground). If they are not...then either the bushing is bad or it was not torqued up correctly. If the vehicle is on a lift with the suspension hanging, the notches will not be lined up.