In the source material they are more specific that they are talking only about the response time of the LCDs themselves and not the 24 fps up-conversion induced problems.
I can say w/o a doubt the 24fps issue is real. Perhaps some people are more effected than other and I must be one of the. Watching 2001 on my new projector there are a couple of scenes where moving spaceships show motion judder as they move across the screen. Also while watching Aeon Flux there are several pans across close up objects the blur. By turning the frame creation mode up to 2 both the judder and blurring completely disappeared w/ limited effect on the PQ in only a few scenes. So anyone who says that the 24fps thing isn’t real I’m throwing the BS flag. Thankfully I don’t see rainbows on my DLP.