So while the con is the one who posted it, this Vtuber is the one who suggested wording it like this and was fine with it until backlash hit.

I was in one of the discords for this con when she popped in to explain so here's missed context: She told everyone that she was the one who provided the information to the con for the blurb and that "birth" is meant to be interchangeable with "debut", as she "hatched from an egg fully formed".