This award has indeed rewarded her "best actor in a movie" for her role as Belle in "Beauty and the Beast". She received the awards for "best actor" and not "best actress".
"Firstly I feel I have to say something about the award itself — the first acting award in history that doesn't separate nominees based on their sex. It says something about how we perceive the human experience. MTV's move to create a genderless award for acting will mean something different for everyone. But to me, it indicates that acting is about the ability to put yourself in someone else's shoes and that doesn't need to be separated into two different categories. Empathy and the ability to use your imagination should have no limits. This is very meaningful for me both to be winning the award and to be receiving it from you, Asia. Thank you for educating me in such an inclusive, patient, and loving way," she said.
This is not the first ceremony to give a gender-neutral award, but this is the first time that it concerns important categories: best actor/best actress in a movie.
The Critics' Choice Awards have a gender-neutral Young Performer Prize. The Television Critics Association Awards also give a gender-neutral Achievement Award.
The only thing we regret here is the rather masculine formulation of the award "best actor in a movie". It should be replaced by a gender-neutral formulation.