Yeah there’s no way this isn’t a flash back. Good ntr is made or broken by the self-doubt faze. I don’t think it’s a video because if you look at the gif Inoda is holding asunas hands(probably because she’s a bit mind broken from the incense). So unless as I said before he’s holding the camera in his mouth I doubt it’s a video. The hiding of the face is weird though but I can think of a reason for it, what if Inodas recounting and telling Kirito about how he lost his virginity. In this way the lack of face could mean that kirito is picturing a scenario but since he doesn’t have the full story asunas face is obscured.