The gather step is so hard to pull off, we got these clowns throwing 3 steps every damn game. If you cought the ball "gathered" right as you take the first step, then its valid. But the timing here is wayyyy off.
Clean, takes a dribble, lifts his right foot off the ground, takes possession of the ball while neither foot is on the ground, left foot hits the ground which counts as the gather step, then right foot, then left foot and takes off. The rule is less than 3 steps, gather step counts as half a step, therefore 2.5 steps which is less than 3, clean fast break layup.