On the one hand, the amount of racial diversity in games is abysmal. There are so many games out there that could've included more minorities, both as NPCs, and playable characters (main, or otherwise). Many of the excuses trotted out to justify the lack of this stuff are just ridiculous bullshit.
On the other hand, I don't think that, in every case, citing historical accuracy as a driving reason behind why your game has made certain decisions regarding which races and ethnicities show up, is bullshit. Regarding The Order, as has already been stated in the thread, there were plenty of black people around Victorian London.
I don't really know much about the game, and am not interested in it, however, given what kind of game it seems to be (AAA, attempting to be srs, cinematic, etc.), I don't think it's unreasonable for the developers to not want to just say "lol fuk it, ur just electrocutin sum werewolves, dudez" and not care about anything else whatsoever. I can imagine some goofy indie game about fighting werewolves with advanced technology in Victorian London including all sorts of characters, racially and ethnically, with no real need to explain there place in the world.
But given the kind of game The Order seems to be, I do think it's fair to expect that certain issues of the time would be touched on. It would be a bit disjointed to have these high society white dudes just chumming along with some black dude or lady, as we all pretend that serious-fucking-racism didn't exist at that time and place.
Yes, they could just include characters like that and not bother to represent any of that awful shit along with it, but it just strikes me as an odd choice if the game is meant to be this relatively historically accurate settings, with a few things changed around.
Basically, what I'm saying is: most excuses attempting to justify the lack of diversity in video games is bullshit. Claiming the need for historical accuracy in a lot of cases is bullshit. But I don't think it is in every single fucking instance, and I do find it a little bit unreasonable for people to just roll their eyes at any attempt to explain why "particular game X" might have made certain design choices that it made regarding these sorts of things.
The only reason it's seen as a problem for specific games is because the lack of diversity in video games is a gigantic industry-wide problem. If 95% of all games had awesomely diverse casts with lots of great representation, I don't imagine people would be particularly upset with some games occasionally choosing to value certain accuracies in their projects. But since that isn't the case in the industry, and since people do make a lot of bullshit excuses, I guess some of the reasonable ones end up blending in with the rest of the bullshit.