Sudo is apparently the art director for the GUI and had some input on the details they put into Tokyo. He also had the same role in P3 and P4 as well as in Catherine as it seems.
Can you actually make anything out from it?
I'd be pretty surprised if it turns out Soejima isn't th art director. So much of his art and style is in the game. Even the logo looks like something he's worked on.
But yeah, Soejima's style is all over the game and I think he even confirmed that he designed the logo.