Hard to say. You claim they are incapable of understanding, which is why they can’t be fluent. however, really, the whole argument boils down to whether they are capable of understanding. You just state that as if it’s established fact, and I believe that’s an open question at this point.
So whether it is circular depends on why you think they are incapable of understanding. If it’s like the other poster, and it’s because that’s a human(ish) only trait, and they aren’t human…then yes.
Don’t get me wrong, I don’t buy his story for a second, but dear God, your whole post exposes ignorance of how couples work, and reeks of “hes the man of the house and should take control.”
I’ve been with my wife for over 20 years. We don’t make sure everything the other does we agree with, and we don’t constantly keep tabs on what the other is doing. Claiming that it speaks poorly of him because he doesn’t keep some kind of totalitarian eye on his wife is kind of ironic in a comments section of this article.