However, bias can show up in what’s not reported just as easily and in that case their is nothing to detect. You're right about not knowing what you don't know

However, bias can show up in what’s not reported just as easily and in that case their is nothing to detect. You're right about not knowing what you don't know. But that doesn't mean that you should blindly trust some discriminator system (which we know can't make any technical guarantees, and comes with additional risks) instead of learning to reason about these things.