I think they are saying that in their revised universe there would be an absolute humanity spanning moral code.
I think what we have is something much better. A flexible morality which is taught from generation to generation and adapted as needed. An absolut moral code wouldn’t work.
Funny enough, that’s exactly the way it actually is. And I believe this system still works; not that we could change it anyway.
And the things that that moral code decide are bad are bad always for everyone regardless.
Still, this is how it is. It discourages immoral actions even when nobody sees them happening, because the person doing them still knows and feels bad/shame/worries.
Wait, how did you take that picture? winkwink