Hmmmmmm this becomes more interesting. One of two things could possibly account for this:
1. The video is a hoax done outside of AQ channels. Moderate to low probability given revealed content.
2. The video is valid, but such tight OPSEC on the Jihadi chatter rooms has prevented those in the 'know' from releasing the info to the 'grapevine'. Moderate possibility
Please ping me if Neosgirl has any other hits.
At this point I'd agree that #2 is the greater possibility.
I believe a hoax would have been confirmed as such by now.
Be happy to ping you to other Neosgirl posts.