I disagree, I don't think you party like that with your employees and post in on Instagram while you are in the middle of hell. It would look to terrible when you had to fire two of them a week later. From Ashley Vance's book, I get the impression that while things are going poorly, Elon is very busy putting an extreme level of pressure on his employees to make it right. On the other hand, if you feel that you have just made it through production hell, and are now feeling like a "Band of Brothers," getting drunk and singing about it would be appropriate. We will never know, but I would not be surprised if this video was taken the night of the sloth tweet/ sunset tweet, when Elon was on the roof of the Gigafactory. He might have been sitting on the video until the batteries aged, tested, got assembled into packs, and were on their way to Fremont. I think we are going to get good news on the Model 3 at the earning call.