Not really, have a look closely on whatever size your screen. I spotted an outline of a hand or fingers on one or 2 of the days. They have taken a short video or just stills and pieced them together for the days sequence.
Me too, you've seen it on yourself but it's an amazing process the body does to restore itself. And interesting to watch in one hit rather than wait 3 weeks or so.
MM, I cant answer that for sure. I would think it just happened and then they decided to film the whole thing. But I guess it is a bit disturbing to think they hurt themselves just to make the video. I mean how starved of attention must they be.
You might notice you didn't get any upvotes for being vulgar with your language. You might also notice that you gave the creator points by commenting on the gif