It was actually really close. The "three points" rule only applies to a dribbler, not to a player holding the ball. if you have two feet in the front court and are not dribbling, but touching the ball, front court control has been established without regard to where the ball is, even if it's behind the line. On the play in question, the player actually stopped his dribble and gathered the ball at half court. But his second hand contacted the ball, ending the dribble, after he had lifted one of his feet from the front court, though it was close. If the second foot had been in the front court when he gathered the ball, and then he stepped one foot into the backcourt, it would be a violation even if the ball had never crossed into the front court.
Also the announcers acting like the half court line makes a plane that matters for a back court violation is disappointing. Front court position is established by a dribbling player not when the ball crosses the imaginary line, but when both his feet touch the front court and when the ball touches the front court (as opposed to crossing an imaginary plane -- it's not like a TD in football, the ball needs to touch the court).
