They’re both big names though so that will have helped secure them the job.
I’m not certain a black lower league ex goalkeeper turned physio or black translator would have been given the same opportunity as Nigel Adkins or Jose Mourinho no matter how good a game they talked in terms of their first management role.
There will be plenty of examples of good black, good white, shit black and shit white managers. Ultimately there’s no significant disadvantage to white managers who have plenty of opportunities and support. If they’re better than their black counterparts they will still rise to the top no matter how many initiatives and schemes are in place.