This piece continues to bother me, so I dug deeper - the original research paper can be found here:
http://maajournal.com/Issues/2017/Vol17-1/Sweatman and Tsikritsis 17(1).pdf
What it basically says is that someone looked to see if they could get images of animals on a specific stone to match constellations using a piece of software. They did get a fit, but only for 4 specific dates:
2,000 AD – Winter solstice
4,350 BC – Autumnal equinox
10,950 BC – Summer solstice
18,000 BC – Spring equinox
They then checked to see whether any related to dating of the stone.
But here's the strange part - someone previously radiocarbon dated the stone to around 11,000 BC. But the last I heard, stone cannot be radiocarbon-dated because ... it's stone. You can only do this with organic matter, because that contains the carbon matter for dating.
So the researcher decided on the 10,950 BC date to match the radiocarbon dating - even though this means the structure would pre-date the settlement by 2,000 years.
In fact, the research paper itself mentions almost nothing about the actual archaeology or dating on the site.
But the researcher has heard of the comet theory for wiping out the mammoths, so immediately connected both dates. That's what the paper states.
The rest of the stone markings remain unexplained, but there is a circle - which is now presumed to be the comet to fit this date.
Which now becomes a "fragmented asteroid" that wiped out the mammoths. The irony being, the Telegraph article in an earlier post points out that the theory that a comet wiped out the mammoths is no longer accepted.
IMO this study is based on flawed assumptions from start to finish, resulting in a grand statement that just isn't supported by the actual evidence.