The Gospel Coalition article about Heaven and oceans is from a series which examines difficult verses in the bible. Now, I'm not a trained theologian. There are many people who have interpreted this verse in different ways, so I can't be dogmatic. But I am nearly so.
Why? One particular verse. If God "placed the sand as a boundary for the sea, An eternal decree, so it cannot cross over it" then I need to understand that if there is no sea, what does 'eternal' mean? Plus I have several other reasons I believe interpreting the text this way. See what you think. Your contributions or corrections to the discussion welcome.