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Had I first read Whose Body? without the preface there is a good chance I would agree with you (I don't really approve of retrospective changes either), but as I didn't (or if I did it's so long ago I do not remember it), I can only say that the preface worked for me.
The writer in me is not willing to be judgemental of J.K. Rowling. I cannot imagine the pressure she must have been under to have something to say, and this combined with the excessive introspection that goes hand in hand with writing (or does for me), must make it extraordinarily difficult to "just shut up". Perhaps I have not been paying enough attention, but I do wonder if your sense of "won't just shut up" may partly come from the sheer volume of attention that the media pays to everything Harry Potter related, that every word Rowling does have to say will be repeated and analysed ad nauseum, perhaps giving a sense that more was said.
I'd also note that Lord of the Rings got a second edition, and Stephen King's The Stand got an extended edition. Fame brings tremendous commercial pressure to not leave things alone, so I don't know that it is fair to blame the author (or not entirely).
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