The fact that he needs a servant-wife to be able to support his career is a red flag. Having so many children and spending so much time working also means he can't have meaningful relationships with all of them.
And how could you call someone a "servant-wife" just for choosing to be a stay-at-home mother? In what universe is that not completely disrespectful to people who choose to be stay-at-home mothers? You are calling a person a "servant" for being a mother and denying her agency by defining her only in relation to her spouse.
By this implication, the opposite of a "servant-wife" is a "working-wife," and it's shocking that you can't define a person independently of a spouse within this framework. The term "mother" doesn't do this, but better yet, it's best to skip negatively judging strangers entirely.
As well say he’s the servant, working long hours while she gets to enjoy closer relationships with their children.