I had the same question but the article said that the wood would have rotted by then. Makes sense since even lumber will dry rot in years if not taken care of. So I can buy the idea that it’s very old because it was preserved in an accidentally special way.

I’m just wondering if it being submerged in water would have affected any readings or measurements they made since who knows what hundreds of thousands of years or even thousands of years might do to the things they are measuring.