Read the rest of the paragraph. They think it is unacceptable and unjust from certain perspectives that are trivial for them. However, there are other perspectives that are worth exploring, and that is what this is about.
Just because someone has formed strong opinions about some aspect of a subject, doesn't mean they can't be open minded about another aspect. They plainly state that they don't have clear answers about many of the questions that Copilot raises, and this isn't going to be the last time that those issues appear. It is these broader issues that they want to hold discussions about, not Copilot itself. I don't see any reason not to accept this interest as genuine.
No, they have a position and arguments to support it, but those have nothing to do with the machine learning aspects, just with the fact that the software is proprietary.
They are asking for views on the machine learning, which they do not have arguments or a position on.