Illegal start of a dribble?

[RefLarry]

#53. A-1 lifts his/her pivot foot and then throws the ball toward A-2.A-2 does not see the thrown ball. After the ball hits the floor,A-1 is the first to touch the ball.Official rules this is an illegal start of a dribble.Is the official correct?

Certainly seems like some kind of violation but "an illegal start of a dribble."? Same as double dribble in anybody's opinion? Wording seems tricky to me.