Did you have to say "I'm a gatekeeper of white supremacy" to complete the training? Either your threshold for "looks cultish" is very high or you didn't go through that kind of training.
I was never compelled to say anything at all; however, it did cause me to think more subtly about racism and white supremacy in my life rather than simplifying it to a reactive good/bad:racist/not racist dichotomy. Perhaps this is all more subtle, complicated, and bonding than the fringe culture warriors would like us to believe.
As with many things, nuance is important. Sensitize people to larger issues is one thing, creating a cult they have to submit to is another.
You can tell people about factory farms without screaming "cow rapist". You can tell people about privilege without spiraling into some racist cult. But that would probably be class privilege, which is much better at predicting success than the color of your skin.
Based on the experiences that I - and my wife - have had in trainings of this type, I am somewhat skeptical that any such “cult” exists. There were moments of discomfort, but I was never coerced or made to feel negative about myself as a white man. I have always walked away from these events with a better sense of myself (for good and bad) which I view as a positive thing.