I have a personality trait of always playing devil's advocate, regardless of my final opinion on the matter, so don't be surprised, but I'll switch sides here a bit.

Don't we all have some implicit biases? I know I do. I have had (and probably, unfortunately still have) biases about women and non-binary people, biases about people from other ethnicities and countries, and although I try to work them out, it's not something that can be done completely.

However, I can't find a rational reason to name these biases "racism" or "white supremacy", words that for any sane person mean not some subconcious thought process, but a fully concious evil. Using these terms in such a way is a very dishonest moat and castle tactic.