That title is rather clickbaity for a "science" magazine. Crucially, the tree prominently featured in the large picture is not 10,000 years old and only its root system originates from that period: > Today Old Tjikko’s tree trunk is only five metres high. Although the spruce may have had many such trunks over the millennia, the tree's root system has survived all these years. No part of today’s living tree is as old…
The cool thing about it and what does give it the 10k year feel is that it grows in a spot that was only low enough for trees to grow 10k years ago because the mountain has risen 100 meters since, and it couldn’t start growing there now.
The article has conflicting information on this point.