It’s quite a step up from cloning a mouse frozen for 16 years and a wooly mammoth frozen for 40,000 years. After 40,000 years you’re dealing with wicked freezer burn.
They will not clone a Mammoth first—they will clone a passenger pigeon. We have one that died in 1924 frozen and we can use modern pigeons as the eggs. I heard they tasted good maybe they could be grown and harvested for restaurants. That’s why they went extinct—they were too good to eat.