It isn't really farfetched that he might have removed it from Zoro's moveset . It makes sense if he actually removed it to be honest.
Zoro is known and is a three sword style user ,yet his strongest attacks come from him forming a deity like figure from an illusion and using a nine sword style?
In his last fight,where people usually use their strongest attack to finish things ,instead of using his signature style he will use nine style ones ? Does it makes sense narrative wise?
Over a decade has passed since the last usage. It isn't really hard to imagine that Oda changed his mind. Wano really is its last chance for me.
Him forgetting making him use it ,really isn't an option anymore after his latest comment
He knows each and every move of any character..