Taking the Bible stories literally to any extent is a relatively new phenomenon (late 19th century). The Jews of Jesus' day, and presumably Jesus himself,did not use that kind of exegesis.
So, presumably, when Jesus spoke of Noah and the Flood, he was not thinking of a literal global flood, so it behooves later readers of his words to not try and fit a silly theory into what he said, it makes Jesus look silly.
The oldest living thing on the Planet is a plant that lives in a part of Tasmania, called Kings Holly, if I recall, it is 43,000 years old, and salt water covering it for even a few weeks would kill it.
The WT has now, and never has had, any idea of how to read and understand the Bible, we who have left need not stay in the same gloom.