This video smelled fishy from the very beginning. Again, please don't be the bearer of misinformation. Do a little more research and look past other peoples crap.
Don't forget, Anon has no leader. Anon does not report to anyone. So it is quite easy to have fakes like these surface. When core members of Anon come forth and say they have nothing to do with a particular message, we generally believe them.
I also thought that the video was a little fish, it looked to good to be true. And also the timing of the video was quite surprising. But in the end it won't change much for me if the video is fake or not. Elon Musk used our trust lightly for his personal again. For the future I hope we all learned that we shouldn't trust blindly what some billionaire posts on twitter. It always takes two to get fooled, one who does the fooling and one who believes it. Maybe Anonymous will now make a real video about him.