Is anyone actually invested enough in Avatar to care about “twists” in the films? My feeling has always been that it’s a series people watch purely because of the visuals. The first one was a big event for this reason, and the second was a big event because it was the follow up to the first one and promised 13 years worth of improved visuals. No one really cared about the story, or the characters, or the world building to my knowledge - certainly not to the exrent that they do for other science fiction franchises like Star Wars or Alien (when Ripley existed).
You can if you pay attention. Multiple people called this out as AI.