Separately from the admissions testing debate: what is your view on the "gatekeepers of white supremacy" and the assorted "I am a racist" declarations?

I don't believe that you believe that this is actually separate. Why else would my opinion matter here?

I know very little about HR departments and bias training. I do know a lot of academics who study race in fields like history and sociology and I do know that people scream at some of them and call them anti-white even though their scholarship is very rigorous. So I would expect there to be a range of quality among bias training and that both high and low quality bias training causes certain groups of people to lash out. But I also have basically no information here.

Well one matter is about inclusivity and the other is about innocent people being coerced into declaring themselves racist.

Separating the two helps the audience determine if you’re speaking in good faith, or if you’re trying to rationalize and cover up an injustice.

Screeds generally indicate the latter.