It seems to be specifically saying "HDSLR" in the description so while that means that no, it was not designed intentionally for the BMCC, it very well could fit. Most people find that DSLR rigs tend to fit the BMCC well. The issues may arise with ergonomics and the cables that plug into the left side of the camera. At that price though it's probably worth it considering that you have 30 days at B&H to decide if you don't like it.
Co-President at fourB Productions, Inc.
Blackmagic Cinema Camera, RED Scarlet-X, Panasonic HPX170, Canon 7D
2011 Macbook Pro 17", 2.3 Ghz Quad Core, 16GB RAM
2008 Mac Pro 2.6 Ghz 8 Core, 10GB RAM
AJA IoXT, Blackmagic Intensity Pro, Blackmagic Mini Monitor
Adobe Production Premium CC, Avid Media Composer 7, Final Cut Pro Studio 3