The Rooney Rule was supposed to result in more people of color in the NFL. All it's done is give lip service to the league's "commitment" to diversity and nothing else.
All teams have to do is interview diverse candidates before making an official hire. Giving a deserving candidate a job is not covered at all. So instead of hiring accomplished coaches or coordinators, teams are giving mediocre coaches like Mike McCarthy and relatively untested coaches like Joe Judge and Matt Rhule head coaching positions. There is definitely a bias there.
Teams are looking at the rule as a checkmark more than legitimate effort to hire a black head coach. The Rooney Rule is terrible and ineffective.
There are problems with the Rooney Rule, but to say it doesn't work is going too far. There were no protections in place for people of color to get a legitimate shot at a high-level football job before the Rooney Rule, which resulted in successful coaches like Dennis Green and Tony Dungy getting fired despite a legacy of success.
The Rooney Rules needs to improve, but it has been helpful in at least forcing teams to give people of color an opportunity to get jobs they were overlooked for before. It has flaws, but the Rooney Rule is still helpful.