To be fair, it's quite easy to wank Kaguya, Her final attack was stated to destroy the dimension they were in and then create a new one and they do have a day/night cycle with a sun. We just never accepted her as more than planet+ level because The Last shows a small artificial sun inside the moon. A badly translated Novel also states that Momoshiki drained a star into exploding or something like that and unless you know better or can read japanese, you wouldn't be aware that the original word used can mean either planet or star. People often use this to support Kaguya being star level through scaling. Toneri has a casual small planet level feat that Nardo and Sauce scale to, but that's the highest they get.