So God is exploiting a loophole?
“And I will establish my covenant with you; neither shall all flesh be cut off any more by the waters of a flood; neither shall there any more be a flood to destroy the earth.” - Genesis 9:11 (KJV)
Yes, that is exactly why He put the loophole there. What other reason could there be? However, before that you cited the many earthquakes we are experiencing. Did those earthquakes destroy the world? I am surprised that when the "by water" comment came you did not cite the massive floods we are having this very minute. How careless of you.
What is the purpose of your questioning God to believers? Are you making fun of them? Are you ridiculing them? Are you reenforcing your own disbelief by questioning the validity of belief? What is your purpose?