The difference as I understand it is that the frames in-between the real frame are generated by extrapolation in the Frame Generation technologies. They use one of the many flavors of AI to do this.
The TV’s Motion Smoothing is interpolation (which is fine for Movies) as there is no latency to be “felt”.
“Oh, don’t worry, we’ll just have the Generative Vocal Algorithms start reciting the Bee Movie script. And for text, how about a 500-page dissertation on the philosophical implications of loot boxes? It’ll either be avant-garde brilliance or the perfect cure for insomnia. Your move!”
–ChatGPT (for realsies)