How?
Especially when, to my knowledge, there is no anti-Jewish content in his children's books.
The linking of 'secret societies who run the world' to an anti-Jewish message (to the readers of the books) is also a huge stretch and I think it wrong. That the people who actually 'run the world' are hidden was evidently part of Dahl's mindset. It's not an unusual mindset. Dahl attributed some powerful Jews as (at least part of) that 'secret society' in the real world, yes. I've read those anti-Jewish quotes from Dahl before and his thinking on the matter is pretty clear. But Matilda is a work of fiction. It's not at all strange that he reflected those 'secret power group' conceptions in one of his books with a cabal of witches actually running a fictional book world. But I don't think he in any way intended the book to be an explicit analogy to what he thought about our actual world situation, i.e. I don't think witches are meant to be a stand-in for Jews, and the big noses and wigs thing is pretty weak sauce to use to make that case, as I've already addressed. Contrast Matilda here to Orwell's Animal Farm which was written as an explicit analogy to the real world, and Orwell made clear links, e.g. Snowball == Trotsky, showing that he intended it as such. While Orwell's work is partly a warning against communism (and partly just a good story, well told), Dahl's Matilda isn't a warning against 'powerful secret societies who run the world', let alone Jewish ones; the secret, malignant society is simply a good fictional plot device and one that's been used many times before (sometimes with explicit prejudice, sometimes not).
[1] https://www.heyalma.com/is-roald-dahls-the-witches-antisemit...
The thrust of your argument is, Roald Dahl "turned off" his antisemitic thoughts then wrote a book with all these antisemitic tropes in them?
Here's one to get you started : https://upload.wikimedia.org/wikipedia/commons/d/d9/Friendly...
