If they only killed a mammoth every 6 months, I wonder how they preserved the meat. That area is too far from the ocean to harvest salt. Maybe store it in the snow? What about summer? Smoking the meat would do it. They did find evidence of fire.
https://paleoanthro.org/media/journal/content/PA20170044.pdf
From spring you can forage and hunt small prey all summer.
I also just looked this up, but apparently mammoths were still walking the earth as early as only 3000 years ago! I thought it was way farther. The idea to bring them back to northern areas of earth doesnt sound so far fetched
It gives me a lot of hope for revival projects that there's relatively 'young' dna to be found. Of course the reduced range towards the end probably means there's not many of these recent sources to source it from, but still!