Nop but it raises the sea level, sinking the world in that way.
I also think this is what happened 800 years ago. And that's why Wano put up a big wall around the island. I also think that's why the Celestial Dragons went atop the redline, because they knew the rest of the world was about to sink.
Everything is coming together.
As far back as 900 years ago, Dressrosa existed because we know the Tontattas were being enslaved at the time, so the world can almost definitely be said to not have been flooded. Dressrosa was has been around as far back as 900 years ago from the Tonttata's history.
This also can't be right because Wano's border is a huge wall around the real Wano which is supposed to be destroyed. The reason for the border wasn't to avoid being sunk, but rather to stop the WG from infiltrating, acquiring Pluton and all their resources.
We already know part of Joyboy returning is to remove the WALL/BORDER of Wano... there'd be no reason to remove the wall if being submerged underwater was something they've been trying to avoid because of the WG.
On a separate note, I feel the summary is leaving out A LOT of context.
The secret cannot be that the world will sink, I think what VP is saying is related to the fact the WG are wiping countries off the map and this raises the sea-level.
Secret of the world can't be the world is going to drown, much rather it's a consequence in the sense that if the WG continue to wipe countries off the map, the world will sink.
The secret is more likely going to be related to the fact the WG are evil and are doing evil things. The big news can't be the world is sinking when we know there are countries from as far back as 900 years ago still around. Pretty sure even Alabasta was around even before the Void Century.
Highly doubt the sea-levels rising is the problem, more likely it's what the WG's agenda is... that is the problem.
Will be waiting for the full summary, but I'd be pretty disappointed by the people giving out summaries if this brief summary is almost completely different from the full summary as it's essentially misleading, but can only wait and see.