It's my understanding that the books released under the Enid Blyton trademark have been continuously revised ever since they were first published, which was long before 2023.

Take a look at any recent Enid Blyton book: there's lots of references to the trademark but no claim that the text was written by a natural person with that name. Some of the books may have been ghostwritten and the Wikipedia article on "Enid Blyton" says: "updated versions of her books have continued to be popular since her death in 1968".

So there's nothing new about updating books. I suppose the problem was that some people wanted Roald Dahl to be treated like a proper author rather than a brand. Enid Blyton has been a brand for decades.