If that's true, thank the lord for this.
Kaguya is the worst big bad i have came across any type of fiction. Any. I did not read many manga and most books i read are not type that people go defeat the enemy after enemy until last one comes; i can 99% say Kaguya is outright the worst from them.
I am glad she did not get dragged on. No backstory, no personality, no relevance (relevance is more than linage Kishi), nothing. She is a dumbo with intelligence beneath part 1 Kiba. She had no contributions to make a story. Uninteresting and unappealing. Good bye.