No reason for a packet meter to look like this. We aren't even sure if this was taken in a "real in-game situation". I hardly doubt that the client was running on several machine, all connected to the same server, that the whole map was generated, etc.
Even if Yoshida confirmed that this was a screenshot taken from an in-game scene, it could simple have been a static scene that took 20 minutes to get generated on screen. The UI and everything else just got photoshopped and added afterwards to basically show what they -intend- to do, rather than -what they already have done now-.