I'd assume it's due to the discovery not being some human remains but rather processed wood, making it the oldest evidence for wood working we have by a massive margin. Quote from the article:
> Prior to this discovery, the oldest known surviving wooden structures were built by people living in northern England around 11,000 years ago.
> Prior to this discovery, the oldest known surviving wooden structures were built by people living in northern England around 11,000 years ago.