Agree with the gist of the previous comments. This is just basic semantic confusion, people or agents who do not exist only exist as theoretical exercises in mindspace such as this one, they do not exist in any other space by definition, and so cannot have real rights to which ethics should be applied.
So focusing on [not just some but] all nonexistent is not controversial, it is just wrong on a basic level. I do not think that this is being close minded ironically, it is simply by definition.
What would be more productive to discuss are possible agents who could be realized with their potential rights, which is fundamentally different although not mutually exclusive with nonexistent agents.