The decription don't specifically say that the Pokémon has to use its hands to do this.
>The user attacks the target’s throat, and the resultant suffering prevents the target from using moves that emit sound for two turns.
So, there is notthing wrong really, the pokémon can use this move the way it wants/can, as long as it "attacks the target’s throat"
(Tthe decription is from this website on the move's page)