The things that court said should have been established, are not questions that should even be
relevant if inability to consent were presumed, let alone irrebutably (i.e. not even permissible to be argued) was being applied. Not to mention that is obviously means no strict liability. You may want to google strict liability. Most forms of statutory rape, sexual battery of a minor, etc, in the civilized corners of humanity apply a strict liablity standard below the age of consent. Indeed, that is the biggest difference that defines what an age of consent
means. Were strict liability the standard, it not only wouldn't matter if the victim consented, it wouldn't even matter if the noble immigrant
even knew his age. He could have subjectively, sincerely thought the boy was 15, but since he was 10, if strict liability applies, he's still guilty regardless.