It's an article that factually reports an aspect of Japanese history, it's not "pushing" anything. The only point it makes is about LGBTQ+:
"Multifaceted gender expressions and LGBTQ+ rights are constantly negotiated and contested. While in recent decades, gender definitions and LGBTQ+ rights have expanded in many parts of the world, Wakashu illustrate how quickly more open and fluid understandings of gender and sex can be repressed and erased."