This isn’t quite correct. There is a lower threshold when contact is with the head.
As per Law 12:
In addition, a player who, when not challenging for the ball, deliberately strikes an opponent or any other person on the head or face with the hand or arm, is guilty of violent conduct unless the force used was negligible.
Once any contact is made, the only thing that prevents a red is if the force is negligible.
The strongest arguments for Yarmo are 1) no evidence of contact and alternatively 2) any force was negligible.
If I’m BFC, I’d seriously be considering an appeal.