That's a stretch. Holding is even a stretch. No way it's a UNR, IMO.
How is holding a stretch? Have you seen the video?
Defensive players are allowed to use their hands to push, pull, lift, or ward off opponents WHO ARE ATTEMPTING TO BLOCK THEM, or when ATTEMPTING TO REACH THE BALL CARRIER, and they may use their hands and arms to ward off or block opponents IN AN ATTEMPT TO REACH A LOOSE BALL. Otherwise, defensive players must comply with the same rules as offensive players. Whether you consider kicking team players as offensive players or defensive players, there is no allowance for FOUR kicking team players to encircle a receiving team player with their arms, grasp that opponent with their hands, and drag that opponent toward the ball, loose from an untouched legal scrimmage kick, in an attempt to have that player touch the ball.
The only stretch there is the receiving team player’s clothing, being pulled by the kicking team players that have grabbed him, and are dragging him.