You're objections amount the the claim that "being able to be evaluated by outside observers" should be a property of morality.

Um, no, I don't think so. I don't think I'm making any claims about properties of morality. Mostly, I'm just poking KPier's/Clifford's position to check for coherence.

because it leads the owner to evaluate the evidence incorrectly.

As I posted before I don't find any objective evidence in that quote besides the two observations that the ship was old and ship sank.