This is exactly why I love breaking down controversial plays with actual referees. Chip Clark nails it - you cannot travel while the ball is live in your dribble. Giannis lets that ball float in front of him for the stutter step, just like MJ used to do. The gather doesn't happen until both hands touch the ball with his left foot down, then he gets his legal two steps. Perfect execution of a move most fans don't understand the rules for.