Because you missed in the same episode during that part where David Cameron said that Leo’s character dying was what had to happen. That was the story. It is a pointless gotcha, based on the movie not spending the time to determine the exact amount of buoyancy of a ship wreck.
Much worse. This tree was given freedom in the Southern US. Slavery was still ongoing. The University of Georgia leased out it’s slaves.
So this tree was more important than actual people.