I agree. And you can do it very quickly, you can automate it and test it as part of a CI/CD system.
Creating training material for employees and then checking that it properly addresses biases is hard. It will be a lot easier when you have a single, resettable, state-free testable salesperson.
I think that’s probably much easier to prove for the AI than a human.
Just send an equal number of candidates in similar circumstances in and find whether minority candidates get rejected more than majority ones.