Looks like they are getting ready to reveal the "reptile ruling class".
"The researchers didn't stop there, even suggesting that these cryptoterrestrials may take on different, non-human primate or even reptile forms."
https://www.yahoo.com/news/harvard-scientists-may-unknown-technologically-150917239.html
"There's also substantial evidence pointing to past human civilizations with high technology that ended for whatever reason."
Cough, Flood, cough!
Spot on. Obviously there's the flood/Noah story from the bible and many, many other religions have an ancient flood story that aligns with the Younger Dryas period around 13k years ago where most of humanity was wiped out. There's a tremendous amount of genetic and geological proof that this occurred, though little evidence of high technology prior to the flood/destabilization of the Younger Dryas period.
What I'm referring to are much older artifacts and signs of high technology, going back millions of years. Out of place artifacts, Antarctica, glass in middle eastern deserts that can only be created by nuclear reactions.