Not really a false start, but illegal motion. After the team has met the requirement of being set for one full second, no lineman may be moving when the snap begins. They may start moving as the snap begins, but they can't already be moving as the snap begins, including the snapper, as in this case. Assuming no other A player is moving, the snapper could have dropped down to address the ball, stopped - one second NOT required - just stopped - then he could begin the snap.
In this case, since the entire team had set for a second, the new false start rule does not apply. This is illegal motion.