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This is explicitly censorship. Film censorship boards would demand cuts and sometimes reshoots of particular parts of a film before they would allow its release. Censors of literary works, when those still existed, would do the same. Cuts or rewrites of parts of a literary work that they would not otherwise allow to be published.

Puffin/Netflix are censoring the works they have acquired the rights to. They are not allowing republication of the author's original works (they hold the rights and are the only party allowed to republish). They are cutting and rewriting the original author's book for new editions. The Oxford English Dictionary defines censorship as “the suppression or prohibition of any parts of books, films, news, etc. that are considered obscene, politically unacceptable or a threat to security”. This is censorship.