Gobekli Tepe Stone Tells of Comet Strike in 11,000BC

My question is how did they get knowledge of something that happened 1000s of years before the stone was carved?

Scientists have translated an ancient stone tablet found at a temple in Turkey. The tablet confirms that a comet struck Earth around 11,000BC, leading to global destruction including the extinction of the woolly mammoth and the rise of new civilizations.
The carvings were found in Gobekli Tepe in southern Turkey, the world's oldest known temple and a site for ancient observatory and worship. In fact, the temple dates back to 9,000BC, approximately 6,000 years older than Stonehenge.

I'm still thinking that Gobekli Tepe stone was carved by Atlanteans.