I don't agree with that. If someone says "The AI is biased" we can just look at the data it was trained on or come up with a set of test cases to establish the bias. We can update the training data or method to remove the bias too.

If someone says a person is biased they can just say "No I'm not" and then how do we tell? We can't really make a person do a million judgments and find statistical evidence. We can't dive into how the possibly biased person came to have or not have biases.