The publishing company holds the copyrights, they make a lot of money from Roald Dahl, but they're worried about the long term prospects for that revenue stream due to social change. Maybe they have additional feedback from retail buyers or customers. They decided to take an approach of retooling their product to fit with changing mores, and either went too far or made a poor PR job of releasing the information.
As far as I know, nobody asked for this. It's fairly well known (at least in the UK) that Dahl harbored many prejudices typical of his generation and demographics, and himself watered down some of them to make his books more salable, eg the original Oompa-Loompas were modeled on African pygmies.