The fact that it’s open to speculation is the exact reason they need to address it. Just ignoring it at this point doesn’t seem like a good idea, does it?
So you must assume either that the decision makers knew through other channels, or that without knowing, they’re out-crowding him via subconscious selectors.
If you think this is a race thing, you probably think everything is a race thing.
There are myriad possible motives. Looking at them all without evidence is not productive. I would say that all credible motives and reasons should be examined. But speculating about every or any possible motive without evidence or meaning is a waste of time at best.