Many spears were broken over the fact whenever or not a Western cartoon can be considered anime if it follows specific conditions... However, I think that the inverse of this problem is much more interesting: can an animated feature made by a Japanese studio, ever be considered NOT anime?
All Japanese animation is anime, but not all Japanese animation is anime anime
the answer is actually trivially yes, it is entirely possible for an animated feature made by a Japanese studio to not be considered anime.
here's the second paragraph of the wiki article on TMS Entertainment:
TMS is one of the oldest and most famous anime studios in Japan, best known for numerous anime franchises such as [omitted for length] alongside animation works for Western animation such as Adventures of Sonic the Hedgehog, Inspector Gadget, The Real Ghostbusters, Rainbow Brite, DuckTales, The New Adventures of Winnie the Pooh, Chip 'n Dale Rescue Rangers, Tiny Toon Adventures, Batman: The Animated Series, Animaniacs, and Spider-Man: The Animated Series.
Wow, Batman: TAS was anime? I had no idea
To clarify a little bit: TMS was one of many studios that Warner Bros. Animation farmed out some of the work on Batman TAS to, but it didn't do the whole thing.
Interesting side note: another one of the Japanese studios that did some work on Batman was Sunrise, which probably contributed to Sunrise later on making The Big O (which is literally "Batman, if Bruce Wayne had a giant robot instead of being Batman") and Witch Hunter Robin (which had a very western "moody adult aesthetic" feel despite being anime). This was in that brief period in the early 2000s when DVD sales in the West were strong enough that anime studios were catering to Western tastes.
Ah yes, the Suncoast years