Well no, it wouldn't. Rowling's "wishes" are not legally binding, whether she stated them aloud or not. IF the book copies her work directly to a greater extent then allowed by law she could legally consent to it being published anyway if she wanted to. You are the one arguing in part that what's his name is a "bad fan" who shouldn't have done this. Maybe he is a bad fan, but I don't consider myself a "fan" in that sense at all, and I don't care whether Rowling personally wishes I had written what I have written.