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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Did this guy really link to a 4chan thread? ( ͡° ͜ʖ ͡°)