The numbers quoted are for each module. Each being 128x128 pixels. They are 15.1 inches square per module. A module weighs 17.6 pounds. The screen assembled is 99mm thick.
This thing is modular for a reason, so it can be custom fit to specific customer needs. The 100 diagonal inch model is for demonstration purposes or as a general use display. These are targeting dynamic signage such as seen in sporting events or other high traffic areas like airports.
What's the point other than being able to say "we built the first 100 inch OLED"? Even if I had the money I would rather have that 55"; 0.33" thin Samsung LED for "just" $5,000. Its the same thickness as the screen on my MacBook Pro!!