That strikes me as sort of circular in reasoning. To create benevolent AI using AI, the latter would already have to know what 'benevolent' means. In which case

That strikes me as sort of circular in reasoning. To create benevolent AI using AI, the latter would already have to know what 'benevolent' means. In which case we might as well just create benevolent AI in the first place. In fact, by relying on a secondary AI it's quite possible we're even more likely to accidentally end up with AI that isn't benevolent.