this is the second time she was confirmed trans. the first time they just said "yeah. she's a woman." and now they're explaining that she was always sort of meant to be trans.

also afaik she's the origin of the slur "trap" used to refer to anyone perceived as a man but who can "trick" the viewer into thinking they are a woman. gets used a lot to refer to anime femboys but obviously is aimed at trans women whenever they show up with these people, and is also used irl some (the worst member of my high school anime club referred to some trans model who was in the news as this slur.)

so basically her being trans is a big deal because of her past as a tool of transphobia, even if clearly the team at guilty gear didn't mean to cause harm. her original role does contain several jokes about people flirting before learning she's "male" so it's not like they're totally innocent, but i'm willing to give them the benefit of the doubt. she was a commonly requested character in all the games since her last appearance, so they probably spent a while trying to figure out how to bring her back without it coming off quite as transphobic as her original appearance and her popularity had become, and i think they succeeded