If this is real, Vegapunk is simply a fraud.
I'm starting to wonder if this is not Oda's plan. To present all fan favorites or the mysterious people that fans wanted to see for years as frauds.
He did it with Yonko or something, I wonder if Oda's message is not something like: "They are not that special".
Vegapunk is literally a guy who just read some books. He's not a genius inventor type.