I don’t know if diversity of thought/character/perspective is quantifiably measurable, but I can absolutely detect it by talking to someone for a few minutes.
Perhaps you can. Perhaps your detection rate is close to 100%, too.
But still, there's only one of you, so the method isn't scalable.
I think this is an excellent example of why trying to create KPIs based on diversity is asinine. People should be promoted and hired on the basis of ability. That's it.