Yeah, the point taken from the study is really designed to stoke tension when it is not really reflective of anything meaningful when it comes to job applicant filtering.
It reminds me of a learning from one of Thomas Sowell's books. There were communities that thought that background checks for employees in certain industries were racially discriminating by their very nature. They moved to ban them. Race disparities in those industries consequently went up, not down. The reason? Without an impartial and indifferent scan of a person's background, employer's were left to use the signals they could pick up on in person, filtered through their own biases. The solution was to allow background checks again.
It sounds like this study is basically saying that without the background check (in this case, actual interviews assessing qualifications), that people are more likely to filter through whatever biases they have at their disposal. Sounds like no surprise... That's the whole point of the interview, to be the impartial and indifferent filter that anyone would be judged by. The solution is to just apply the interview and not judge based on a few seconds of dialogue. Which nobody does anyway. So it's not testing for anything real.
(Cue many knee-jerk anecdotal counterpoints to "nobody does that anyway." Please. You're not getting that software engineering job by being an artist with no prior experience who flashes high-class speech for 10 seconds.)