From reading the comments over on /r/spacex, this looks to originally have been an unlisted video in SpaceX's youtube channel, and shortly after appearing on reddit it was made private. Not before several people had made copies, however, and re-uploaded it (one of those people has the same reddit username as the youtube channel linked here).

That said, impressive video. This shows how close they are truly getting.

Unfortunately, it doesn't stop clickbait headlines that imply that this was a setback (for a while, drudgereport was running a story with the headline akin to "SpaceX rocket fails to land on landing pad"). Maybe that is why the video was made private, out of fear of appearing like a failure.

Of course, now that the cat is out of the bag they are better off embracing the video.

SpaceX has now published the video on their channel: https://www.youtube.com/watch?v=BhMSzC1crr0

I guess that's what "This video is unlisted. Be considerate before sharing." gets you in today's world...

Also somewhat interesting that it appears to be the same angle as the official video posted to Vine [1], only in drastically higher quality.

[1] https://vine.co/v/euEpIVegiIx

The video appears to be a leak from inside Space X.