Yes but just because someone has an objection does not mean a thing is not well-established. As I think I suggested before, it looks to me as if Hawking radiation is not yet settled science, as nobody has yet observed it unambiguously. So there is room for disagreement about it, as there is for many things in science. But it is accepted as likely by a great many people in the field and as such it is a well-established hypothesis. Isn't it? I don't see this as a big deal.