Until I've seen it I won't know if the casting has been deliberate, and therefore can't know if it works or not. Is all of the Boleyn family black and everyone else white, or is it just Anne who is black? Is their blackness to represent a faction, or is it just random?
Without knowing things like this, how can we know if it is effective or not? In any case it is not 'changing history'?. I assume that the OP isn't suggesting that the dialogue should be in 16th century English with smatterings of French, in order to be 'authentic'?
Nothing we do today will change history. History has happened. What we can do, and have always done, is to reinterpret how history is understood and explained.
The Tudor dynasty is one of the most represented historical periods on TV and in film. Over the years that representation has shifted from 'Bluff King Hal' to Henry as a narcissistic tyrant. Now it is thought that he may have had a blood disorder called Kell positive, which caused the miscarriages of the babies lost by his wives (the syndrome does not affect firstborn children, but will kill subsequent ones if the mother's blood does not 'match' that of the father). Kell positivity can also cause McLeod Syndrome, which can lead to psychotic behaviour, obesity and problems with limbs. Previously it was thought that he may have had syphillis, or that his temper was a result of a fall from a horse.
None of that is 'changing history' - it is adding to our understanding as our knowledge develops.