IIRC the 2013 "racism predicted by telling leading questions" one and ita predecessor, which is listed here but also says there is slight trend toward replication, is just based on implicit association tasks. So you have a green and red button for good and bad, and then a word pops up and you have less a second to choose which button to press. Oversimplifying complex thought processes in my opinion is junk psychology.

It’s also self-referential because there is no objective measure of “racism,” so how can you even measure whether someone is “more racist” based on reaction time to stereotypical stimuli?

“No objective measure” pretty much sums up the whole field, to be honest. I started on a CS & Psych double major, did about eight psych courses, and then decided it was mostly a joke once I got to the quantitative portions. But those courses were very useful for general life skills. Developmental psychology in particular was packed with dense lessons about how we learn as children… social psych was a good overview of all the “well-known” experiments… etc.