Not necessarily. There could have been a flood of gigantic proportions many thousands of years ago dating from one of the
Pluvial Periods, and the earth is something around 71% covered in water.
Additionally, mammoths (which became completely extinct about
4500 years ago, coinciding with the Biblical Flood) and saber-toothed cats all suddenly, according to an article I was just reading, completely disappeared from North America and Europe.
Note: This isn't to say that the Biblical Flood happened with certainty, but with evolutionary uniformitarianism, evidence could simply be misinterpreted (not saying it is).
Just a thought.
Regardless if anyone accepts this or not doesn't matter to me personally. But we have evidence which could suggest a global flood as being a
distinct possibility.