99% chance this is just a Photoshop. The blog is about "visuals", not hacking or computer security, and I doubt that being a graphics designer is the key to figuring out how to transmit video to a Times Square video screen.
There's also the hand waving. Usually experimenters are so proud of their puppies that they can't wait to publish the schematics.
Finally, the author is a film maker. Film maker get it ? He made a cool fake film, kudos to him, that's what he's good at, and he got us to talk about it.
Film-making and HDSLR does not translate into "graphics design". http://en.wikipedia.org/wiki/DSLR
Most people probably aren't really watching these things. They either process it with their peripheral vision or glance at it for a while when they're really bored and there's nothing else to see.
Now, the image is rather ordinary and stays there only for a few seconds.
This isn't flying saucer or a plane crashing into a building. It's just a dude on a TV that displays ads.
How different is it, really, from the famous Blade Runner ad?
http://www.youtube.com/watch?v=ZZ17UsZ0DEQ
Also, the camera almost never films people who actually see the screens. So even if there was someone pointing finger at it, we wouldn't see it in the video.