The last three Disney films that starred POC were the Emperor’s New Groove in 2000, Brother Bear in 2003 and Princess and the Frog in 2009.
What did they have in common?
Well, that’s wrong first of all. Atlantis: The Lost Empire had a dark skinned character voiced by a black woman (Cree Summer), so they obviously aren’t white. You also didn’t mention the Hawaiian Lilo and Nani from Lilo and Stitch…
Let’s look at the movies you did post, however.
1) The Emperor’s New Groove. There is very little doubt in anyone’s mind that the movie took place in anywhere other than the Incan Empire of South America. There is little doubt that the emperor of the Incan empire is an Incan. All of the characters are Incan and have Incan features - except Yzma, who is purpleish. But just because a single person was transformed into a llama does not mean that they’re racist or erasing identities.
2) The point of the story is to show brotherhood, and they chose the medium of the story to be animals, hence the name Brother Bear. It’s not about the struggles of Inuit people, it’s about bonding. But the main character has an Inuit name, and established at being Inuit, and there aren’t white characters in the movie.
3) And…so the main character was transformed into a frog in a modern retelling of The Frog Prince. So what? She is still obviously voiced by a black woman, and is shown to be black before the transformation, and the story end with her being human (and black). It’s not like they’re trying to say that she’s not black - they’re saying she was transformed into a frog, but is still the person she was. The white characters are minor, or used as a sidekick.
You’re ignoring the other non-white characters that Disney has had - such as Mulan, Jasmine, and Pocahantas.