Why do you think it had to come from an outside agency? The Lead Character Designer's comments in interviews and on X/Twitter seem to be completely on brand with the characters/DEI in the game.
Edit: I see you said "or them" in your previous comment, sorry, missed that. But my general interpretation is that these are his politics, and he himself put them in the game.
Owner of PS4 Pro, Xbox One, Switch, PS Vita, and 3DS