That information was of August 12, 2010. At that time Skyrim hadn't been announced.
That does not make the argument valid.
In the same press announcement of the acquisition, it states that Bethesda
Softworks and Arkane Game Studios are doing a
publishing deal. Also, there has been multiple confirmations, if I recall correctly, that they are not working on a game with Bethesda
Game Studios, in this case, Skyrim.