It is definitely a slur, as well as "terf" and other noncense a group of narcissistic people have come up with to bully men and women who don't participate in their delusion. Like I said, tone it down. This is not a reddit trns thread, it's a manga site. Read your manga, talk about the story and keep your own issues to yourself or discuss it within your own echo chamber, and stop being dissrespectful to people. We are not here to indulge you, or put up with your bullying.
as a trans person im so proud to see this story exemplifing how omegaverse can be used brillantly to showcase the gap between sex and gender, and how it can be used as commentary because of that. this manga makes omegaverse feel fresh because to me instead of just seeing it as ironic that men are talking about women's struggles in reality, i also see it as a dystopian reality for me; what if i could pass as a man but my partners built in societal bias still equates me to a woman and the abject misogyny that comes with viewing women as merely a body to conceive future generations ? omegaverse is a unique world that can put on spotlight how feminism has always been interconnected with transgender rights/freedom, because both of our communities not only intersect but understand each other.
sorry if this is not written out well