For Squid Game, I've seen multiple theories that Il-nam was treated differently in "Red light, Green light" because he does not have a green hue in the robot's vision but I feel like I see a faint one in the playback. Was he really safe? Or is this just conjecture?
There's no evidence to support whether or not Il-nam was treated differently in Red Light, Green Light
Looking back at the scene you can see that most people are not highlighted at first:
The robot determines who moves and who does not move. It highlights the still players as green and the moving players as red.
As you can see, Il-nam is highlighted in the second image.
So based on that alone, we can't really tell if the robot was programmed to ignore Il-nam. We really don't know if he's treated any differently than any other player in the game up until game 4 because he plays and wins each game up until then.
It is still possible that had Il-nam moved during the red light phase that the robot would have ignored him. We never see him do it, so we don't know.