They mention Mycobacterium leprae which is the causative organism for Hansen's. I'm not sure I agree that leprosy described in ancient writings is not what we see today. If you read Leviticus 13, it gives the Temple priest instructions on how to distinguish clean from unclean skin lesions:
13:3 "And the priest shall look on the plague in the skin of the flesh; and when the hair in the plague has turned white and the plague in appearance be deeper than the skin of his flesh, it is a plague of leprosy; and the priest shall look on him and pronounce him unclean."
Sure sounds like tuberculoid leprosy to me:
