From the article, talking about the complaints citing the Moms for Liberty rating system:
“Anne Frank’s Diary” and “Maus” both rate a “2” on BookLooks, with the site’s objections to the latter described as “hate involving antisemitism and racism; violence; nonsexual nudity; and mild/infrequent profanity.”
Would you look at that: non-sexual nudity, oh the shock and horror, children might learn that underneath clothes people are naked 😱
As shown by the complaint quoted in the article they're removing these books because they discuss historical horrors, violence, and hate, therefore your argument holds no water at all.