I can understand not wanting their product misrepresented, but all the secrecy and censorship about it makes me believe it is bad, and I'm not going to spend money on something I believe is bad.
People were able to film through the lenses for standard VR glasses. I can't find anyone that tried it for Hololens but given that they also cost several thousand dollars it's probably not that surprising. I have used the Hololens quite a bit and I can't see any reason why you couldn't film from the eye's point of view.