Thats ridiculous. Perfectly sharp shaddows etc. No way is this real and ain’t gona be without major technology advances.
As article says you would need a super graphics card for each player or be able to batch the scene and with all that light interaction they don’t say how that could be done.
Only way in my mind to currently achieve something like this is a pre rendered database Quicktime VR style on a Google farm like the way Meez render their avatars but clearly that’s not what’s going on.
City bits sure a purdy though. Good modellers. Which is what I think they want to hear from people watching video.