Unconscious bias is not implicit association. Unconscious bias is rationalizing decisions based on the candidate's personal characteristics as something else. Studies about unconscious bias readily replicate, i.e. https://hbswk.hbs.edu/item/minorities-who-whiten-job-resumes...

Most training to overcome unconscious bias is about defining criteria before you see a candidate. If, before you view resumes, you've written down "We want someone with a master's degree and 4 years of experience in field X," you're much less likely to pass over a qualified resume, regardless of the candidate's personal characteristics.