I would guess the change was made because they felt ladies and gentlemen does not account for non-binary genders

does that matter when there don't appear to be any non-binary people in any of Roald Dahls works?

Oh my goodness how dare he!

Did you just assume their gender?

(I'll see myself out.)

they forgot the queers so it should have been "folx" in double-non-binary

Goodness how could he assume that before asking their personal pronouns? /s