Again, it's not about where it's made, since virtually all American animation since the '80s has been made in Asia anyway. It's about where the creative work is done, whether the writers, directors, and designers are Western or Japanese. (By analogy, Star Trek: Discovery is an American show even though it's shot in Toronto, because the writers and producers are based in Hollywood. What defines a show's nationality is where it's conceived, not where it's physically made.)
See, here's the thing -- "anime" as a genre label is a Western concept. In Japan, it's just the word for animation in general. So it's only Westerners who perceive "anime" as a particular style distinct from "ordinary" animation, and thus it's Westerners who define what the term means in that sense. And the general consensus these days tends to be that it's a function of whether the directors and designers are Japanese anime creators, even when the writers are American (e.g. with Batman: Gotham Knight, The Animatrix, or some of Netflix's anime shows like Cannon Busters).