Is the Earth a Human Terrarium?

Author says crypto terrestrials are living among us and use advanced technology to mystify us. They have been here for thousands of years now, after having come from future time. Their reason for returning is to repair, re invigorate failing genomes. To them we are ancient versions of themselves that are healthier in certain respects. But they require us to bolster their own deana with some of our ancient diana dana before we began to mess with our own ana deliberately.