I've heard all those excuses before. But as you see, not one of them says the whole world was flooded.
And yes, I've shown you several times that the text of the figurative passages is in the poetic form used for myths in Sumerian and Akkadian literature, while the others are written as literal histories. I realize that you don't accept it. But it still remains.
Indeed, the key to understanding the story of Noah, is to realize that God put it forward in a way that rejected the previous religious ideas of that civilization, asserting that there was one God, not many gods, and that He is a just and ethical God for Whom evil is offensive and goodness is pleasing, as opposed to the old Mesopotamian gods, one of whom flooded the land because people were so noisy his nap was disturbed.
Another key is in the description of Noah. From Paul's letter to the Romans:
Romans 3:10 As it is written, There is none righteous, no, not one:
But in Genesis:
Gensis 6:9 These are the records of the generations of Noah. Noah was a righteous man, blameless in his generation. Noah walked with God.
Here, Noah is the archetype, the model of the righteous man, as opposed to the sinful people around him. It's another sign that this is an allegory. Keep in mind, one can have an allegory about real people and real events. But these are signs given by God that show there is more than just an account of someone and some happening; there is a lesson therein that was particularly needed in the time that the story of Noah was written.