That apparent problem goes away once you recognize that you’re using the word “censor” incorrectly in one case to draw a false equivalency. In the case of the right-wing behaviour discussed here, “censor” is the correct word because the term refers to an official use of power to prevent something considered politically incorrect or obscene from being available even though the publisher, librarians, and reader all thought they should be accessible.

In the case of the Dahl revisions, there is no official power being used to suppress individual preference. The publisher decided they wanted better sales for an older item, realized that things like anti-Semitism were unappealing to modern audiences, and created a new edition of their own property. Every part of that process was entirely voluntary and nobody’s purchased property is affected in any way – quite unlike the right-wing telling libraries to remove books with significant literary value which their patrons want to read.