I thought all that was confirmed in Whitebeard’s dying words. And with Clover’s dying words. The only thing that’s been missing is the what and why of those things, intentionally not discovered because Luffy is nowhere close to learning about either of those things, and won’t come close for a long time.
Separately they confirm nothing, before Robin brought up the Will of D to Rayleigh the two plots hadn't been connected at all.
Whitebeard outright confirmed that it existed.
The World Government Specifically targeting Ace confirmed that the World Government is Scared Shitless of it.
Rayleigh and the Red Poneglyph's existance confirmed that the Glyphs and The One Piece were connected, and that the Roger Pirates knew the history of the world..but did not say it was from the One Piece, only that Roger could hear the voice of all things (which seems like it was a cover for Oden's existance, it could very well be that Imu does not know that the Kozuki Clan can read the Poneglyphs)
Clover and Vegapunk confirm that The Current Government* fought against an Anceint Empire that had extremely advanced Technology, that Joyboy was a member of the Ancient Empire and that the Current Government won that war. Part of this war was the use of the 3 Ancient weapons, which were used 20 times, and raised the Sea Level by 20 Meters (which is about a Third as much as sea levels would raise IRL if the ice caps melted)
Franky and Iceberg confirm that One of the weapons is a Ship called Pluton
Robin confirmed that One is a Mermaid Princess that can speak to Seakings.
Robin later also confirmed that The Pluton was still in existance, and was in Wano.
So that is two weapons accounted for, neither of which seem capable of doing something like raising the actual oceans, this leaves Uranus as the one that is unaccounted for, and is possibly the one Imu used to delete Lulusia.**
Oden confirmed that..the Will of D, The Void Century, and Joyboy were directly connected..and that there is something that Roger Laughed at.
Each thing confirms different things independantly, the reason I am kind of coming down on there being more than one thing is because "The History of the World" doesn't seem dangerous enough for Imu to go to the lengths he has to keep it all secret, it has to be something that is an actual threat to his rule.
*A government which is entirely a fucking lie, the entirety of how the Kingdoms of the World think that things work is fundementally a complete fabrication, This is one of the reasons I think that Laugh Tale is something directly threatening to Imu. The Elder stars are Yonkou Tier in terms of strength, in terms of Military Power Imu could easily show up while the Kings are swearing to the Empty Throne, sit his ass down, whip his cock out and start jerking off and unless the 4 Yonkou are there..nodoby is gonna do one fucking thing about it.
**It occurs to me that "Nuke shit from Orbit" is somewhat out of line with the other 2 Ancient Weapons. Controlling the Sea Kings and a Powerful Battleship are cool but not "The end of the Fucking World" tier. I kind of wonder if We and Vegapunk are kind of off on our guess that Imu has the last Ancient Weapon and Uranus is something..to counteract whatever Imu actually has.
I’m pretty sure the thing that provoked talking about the treasure was one guy in the crowd.
I am kind of assuming that Roger assumed that someone would ask him about it. Him setting off the Age of Pirates was certainly a set up..why else would he turn himself in?