This could help people learning any language, but people with an irrational hatred would rather have a knee-jerk reaction than think critically. They think this will make people stupid when they're already so stupid that they can't see actual use-cases.
I think people are just annoyed about the AI being used, especially when it's literally replacing the beautiful language used with simple tldr but the language is only part of the art piece, and usually the hardest one to digest if you have problems with reading.
Lord of the rings is amazing book for so many reasons, and if someone took a shortcut (skipped the songs or watched a movie) to learn the story I'd be happy for them - the story, the characters, the world are already absolute beauty even before considering how Tolkien told the story.
It's irrelevant that AI is being used. Books being summed up has already existed for many years as Sparknotes. This advent hasn't stopped people from enjoying great books.
There are lots of good reasons to hate on AI - like the fact that it's increasingly being used in a military capacity. This just isn't one of those reasons.