I think the 'royal racist' thing has dragged on for so long that frankly nobody much cares anymore. It was shocking at the time, but the time was two and a half years ago. Time for the accusers to put up or shut up.
Plus, given how vague and contradictory the original accusations were, I'm not sure how any official statement could have been issued. Do you know exactly what all your aunts, uncles, cousins and in laws might or might not have said a few years ago? I doubt it.