Without actually seeing the video clip and faces of actors, I agree it sure does make it hard to determine its legitimacy.
Judging those few images though, to me it doesn't particularly look fake, however it does not look like something we'll see in the final film either. Curious why the clip would be removed too, as well as the uploading account. So, I'm still willing to believe it was genuine test footage.
As for the bearded guy, maybe it's just a Luke-alike for this test footage. Hard to say.
It is intriguing nonetheless.