Looking for ideological perfection in literature is a losing game
It is impossible for a book to have no problematic elements, especially when what we deem problematic has changed so rapidly over the last couple decades.
Describing an antagonist as "ugly" or "fat" is just fairytale shorthand for "here's the bad guy." It would be incredibly rude to call someone ugly or fat in real life. But I remember being a kid. When another kid was mean to me, like Adam in 4th grade, I decided he was an ugly MF-er, even if objectively he looked like a normal 10 year old.
It's very amusing to me that this style of critique --whether a book is "progressive" enough, especially in how villains and bad guys and rivals are described --is so similar to the discussions religious conservatives were having in the 2000s about whether Harry Potter was promoting witchcraft.
This is not to say that lit critique is not valid. We should be analyzing literature and trying to understand the values that are being promoted, especially when those books are aimed at teenagers and kids.