You can find sauces all over that thread, the gaming media is trying to cover up the fact that these files were in the game.
The E3 2012 graphics were there the whole time. In the game's files.
You literally just have to change a few zeroes to ones and BAM! E3 2012 graphics.
Ubisoft INTENTIONALLY turned down the graphics on the PC version to make the console versions more appealing!
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I just installed it. My game actually runs better, more npcs, better lighting etc. One thing to note though is the DOF is set to blur waaaaaaaaaaaaaaaaaaaay too close, things get blurry at about 30 metres on foot for some reason. Driving seems fine though.