The pharmacological secrets that Pasteur discovered are simply rediscoveries of things that were known at the time of Atlantis but lost during the great dark age. Some of the things that Pasteur does will later be superseded by better practices; and the things that he did will be known to have not been the best way to do it. That’s what I mean by the «by the other rumors he shall be dishonored».
«When the moon completes her great cycle» refers to the many cycles the moon has that the scientists do not seem to be aware of; so they are confused with the purpose and the construction of such structures as Stonehenge. For one, the great cycle of the moon encompassed the time from the fall of the Atlantis civilization to the gradual rise back to civilization again and the rediscovery of knowledge that was lost centuries before.