As an empirical fact, humans are not perfect human face recognizers. It is something humans are very good at, but not perfect. We are definitely much better recognizers of human faces than of worlds high in human values. (I think it is perhaps more relevant to say consensus on what constitutes a human face is much. much higher than what constitutes a world high in human values.)
I am unsure whether this distinction is relevant for the substance of the argument however.
As an empirical fact, humans are not perfect human face recognizers. It is something humans are very good at, but not perfect. We are definitely much better recognizers of human faces than of worlds high in human values. (I think it is perhaps more relevant to say consensus on what constitutes a human face is much. much higher than what constitutes a world high in human values.)
I am unsure whether this distinction is relevant for the substance of the argument however.