Did I miss something? When did the definition of "judder" change? I thought it was an effect caused by a content's frame rate not dividing evenly with a TV's refresh rate.
Yah, I think in terms of video content the more correct term would just be stutter, but then that gets complicated when you talk about games because stutter means something else. Judder in video usually refers to what you're talking about, with 2:3 pulldown. Ultimately it's panning of the camera not looking smooth, which is extra apparent on OLEDs because the pixel response times are incredibly fast, so there's no panel ghosting to blur image transitions. You still have some motion blur because of sample and hold, but overall 24p video, or 30 fps gaming look far less smooth on an OLED than on an IPS, VA or TN panel.