Really? Where did you get that choice nugget of hogwash?
It is established science. The fossil record for over 120 species of mega-fauna stops cold at about 11,600 to 12,900 years ago. DNA is establishing a huge die off of humans at the same time.
Re: "choice nugget of hogwash"
11,700 years ago, the Earth was slowly but steadily warming from the last Glacial Maximum, which occurred about 20,000 years ago.
In a period of just a couple decades, ice cores in Greenland show that the average temperature in Greenland dropped by 18 degrees F!
An event like that today would probably kill hundreds of millions of humans, because of crop failures and a shortage of energy for heating.