My take is if they are trying to make real change and not score points with PR and press releases, just cast whoever you want (black, white, or otherwise) as Santa (or whatever other character), but don’t make a huge deal out of it. If a customer notices and asks, just say, “Well, that’s who we hired this year.”
Treating something as trivial as in-park casting decisions as something abnormal that requires major PR announcements keeps people from seeing things like this as normal, which is where I hope we are all trying to get to.