Notice that: The Flood Myth appears in the connection with the cultural creation story in generally. This story has become somewhat culturally forgotten and distorted in many ways as times went on - as also in the the case of the biblical intepretation and perception.
In your linked article there also is a relevant link to the Philippinian Creation Stories -
Creation Myths from the Philippines - which specifically deals with the creation of the Milky Way, which was/is the largest local observable part of the Universe.
The very concept of "water" in the creation stories are meant to describe celestial "cosmic clouds or rivers of gas and dust" which came together and created firm matter in the galaxy. In this sense one better can understand the contents in your first link whereas it is not very logic otherwise to understand how "water can create mountains" as referred above.