OK, hold up…
These maps Luthor is using for his presentation were not just scribbles on a cocktail napkin. They were highly detailed, professionally designed, printed maps of a known megalomaniac's evil plan installed in the gallery of his private yacht … all in the off chance that he’d have an opportunity to brag about his plan. Seriously, if Lois Lane and her son hadn’t snuck aboard that boat, who would he have shown these maps to? His henchmen? They were probably the ones who designed, printed, and installed the maps in the first place! It’s not like he could’ve outsourced this project/evidence to some designer on Fiverr and had it printed at FedEx Office.
Also, the maps of this new continent are purely speculative. Lex Luthor has no way of predicting how big the crystals would grow or what shape the new land masses would take. The only hard data Luthor had to base these maps on was a small-scale experiment he performed one time in his basement about two days ago. This is the cartographical equivalent of proposing on the first date.
Warner Bros. Pictures
Plus, he already divided this fantasy land mass into different … countries, I guess? Yeah, that’s not gonna be his decision to make. The whole crux of his plan is to hold a monopoly on new land while the rest of the world floods, and that anyone who wants a piece of that land is gonna pay through the nose for it. Well, genius, if you destroy half the world, the global economy goes down with it. They could pay you everything they’ve got, but that’s no guarantee that it’s gonna be worth anything. Besides, they won’t have to pay for it. By doing this, you’re pissing off every nation on Earth, and their military forces. And if you don’t think they’ll take your land by force, you might want to crack open a history book sometime.