... not really? Mulan is all about a woman pretending to be a man, which is genuinely distinct from being a transdude. She spends most of the movie in military drag.
If this extremely 2013 Tumblr shitpost has any issues misrepresenting queer people it's down to nobody acknowledging bisexuality. Which we're honestly used to.
Mulan is a GNC woman who learns to synthesise femininity and masculinity and use them both to become the biggest badass in China. We honestly don't know if Mulan is cis, trans man, or nonbinary. But it doesn't matter, because the point is that no matter who she is, she can't be that person if she's expected to follow a rigid gender binary.