No. To judge, if the action was legal, the moment of the playing the ball is the crucial point. Because the player did not take any support while he was hitting the ball, his action cannot be judged as an assisted hit. Legal and attractive play.
Rule 9.1.3
Since the 1st referee changed his/her decision, which was the basis of the substitution, the coach’s request must be accepted. No substitution would be charged against this team.