I feel like this COULD be a "you're not my sister' kind of line, rather than a" you're not a woman" one? I know given the context it's probably unlikely, but idk. I know they also changed the name of the group to what it was originally in Japanese which excludes sister altogether, so it could also be a reference to that. Idk.
https://imgur.com/kHnd6lr https://imgur.com/uG042id https://imgur.com/tIfDfZH https://imgur.com/xhtRl8w https://imgur.com/ggQozRe https://tinyurl.com/Corn-420