Didn't they say it was classified? I think just before the separation of the rocket and payload, they said something about what it was.
13:38 in the video "Falcon X is delivering the, National Reconnaissance office's satellite to orbit right now"
13:38 in the video "Falcon X is delivering the, National Reconnaissance office's satellite to orbit right now"
The webcast host may not (I'd guess he probably doesn't) know what the satellite does or its final orbit. He does mechanical design. I'd bet they keep that information compartmentalized within SpaceX so only the operations personnel who need to know would know.
It's worth noting that the very existence of the National Reconnaissance Office was classified until 1992, although it leaked out to the public in the 70s. They're a bit less secretive now.