The question against a world wide flood is “where did all the water come from and where did it go?”:
“the Japan subduction zone alone could transport the equivalent of up to three and a half times the water of all the Earth’s oceans to its mantle.”
Unfortunately, you left off the most important part of the finding.
Over the age of the earth“the Japan subduction zone alone could transport the equivalent of up to three and a half times the water of all the Earth’s oceans to its mantle.”
"Over the age of the earth" is vastly different than "over a few months time" which is the length of the flood story in Noah's time.
Never forget that the global warming adherents think that an increase of 1" in sea level over a century is much too much for the earth.