This is what any reasonable person will think. I fully expect FB to argue that "oh these are just some computer bits you see. There is no way to from this model

This is what any reasonable person will think. I fully expect FB to argue that "oh these are just some computer bits you see. There is no way to from this model deduce what inputs made it into this model. It's like a hash function. And since we have removed the inputs, we have complied." That they are in essence keeping "the ghost" of a person is another thing.