Vanilla is a product of Lussumo:
Documentation and Support.
In May 2010, Ross appeared in a video for a somewhat secret project, How to Destroy Angels, a collaboration known to include Reznor and his wife Mariqueen Maandig.
Explain the conclusion that this is obviously a album filler track.
This just happens to be a slow song (and from what I've read is the last on the EP)