I'm still unclear why you would think that people would openly discuss their prejudicial biases when discussing their interview processes and decision making.

I'm still unclear why you would think that people would openly discuss their prejudicial biases when discussing their interview processes and decision making. The behaviour isn't socially desirable, has potentially serious consequences for disclosure ("The Triplebyte people won't work with us because I told them my interview process begins by throwing out all resumes with funny sounding names."), and assumes that the people involved are aware of their behaviour.