Yeah, well, China is a big market. Because how things were back then, Avatar is a new movie for the moviegoers in China and they have defeated the pandemic basically there so few restrictions in place.
"re-release numbers alone surpassed Disney's Mulan Chinese box office total"
Yeah, well. The Mulan live action movie flopped in China. China made their own Mulan movie a few years back: https://www.imdb.com/title/tt1308138/reference