First of all none of this is really confirmed , so it´s techinically all on your part.
Sorry to break it for you but as long as it remains unconfirmed and not literally part of what the game is , then it´s just your headcanon.
For the Soul Calibur part , is a pretty close example to this situation in the actual storyline. I honestly will take it as you dont know what you are saying in here because that´s literally what happened in the most recent main canon game of that series.
Trying to invalidate a point without elaborating is so cute , but pointless because it does not work at all.
i think it´s beyond obvious they are not going to refer to something that clearly resembles a female as an ´´it´´ , the only instance they have ever done this is one time with Birdo and that´s because the whole gender thing.
Lastly , all this talk is super fun but the end its the same.
Its not official , not confirmed and thus all tied in your personal views , not with the actual game.
I mean by all this fault logic of many of you , then we can also start calling Rosalina a princess since the amount of so called evidence based on pure assumptions is the same as saying she is literally the cosmic spirit.
But i guess , as usual , some loooooove to nitpick till the end when its about what they like to hear and when something they dont like at all comes in , they ignore it.
In this case , the game does not say it , the booklet doesnt either , Rosalina doesnt either , Mario doesnt either, nobody involved in the game as far as we know do not say anything about it either.
The power of assumptions.