Getting full points isn't the trigger to get the SQ3 Easter Egg. You'll have to explore the game to find out how. If you're on the right track, you'll hear a clue.
Thank you. I have also found that the Secret bar Easter Egg does not work anymore. Whenever I try to smell the stairs at the edge of the chasm in Labion, nothing happens. They show up only when I fall of the chasm. Is this a bug or you removed the Easter Egg on purpose?