Yes, this is simple.
Locked hands are legal from the neutral position.
Thus the wrestler DID NOT use an illegal maneuver to score. After they were down on the mat, locking hands becomes a technical violation if they are held beyond reaction time. It is incumbent on the official to let the top wrestler know that he has been awarded a takedown, so the wrestler knows he has to release or break his locked hands. Wrestlers often think they have a takedown way before the official does. Thus most wrestlers will keep the advantage of locked hands until he is certain he has been awarded a takedown.