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 gotta say, it's been fun watching the Ubishills in /v/ defend their company during this by trying to derail the conversation by downplaying it as a mod when in reality all the dude did was flip a couple switches from the off position to the on one.