NTA.
A community existing on a separate independent instance shouldn't be a factor in deciding if an aita community exists on this instance. Even though !aita@lemmy.world will have more traffic, this community should still probably exist because a local lemmy.ml option isn't a bad thing, and we'd have an established alternative should we ever need to defederate lemmy.world for whatever reason.
YTA for setting the community language settings to disallow specifying English as an option though 😜