To me, I like to see when they stutter or slightly-fail, since that to indicates the dynamics and real-time part of the thing, that it is not a 100% scripted thing (although the blog post mentions the engineers fine-tuning the celebratory arm-pump, to what extent is that scripted then?)
This behind-the-scenes video says it is choreographed and scripted. It also contains instances where things go wrong as well.
1. [EDIT: IGNORE THIS POINT] They've done this before. [1]
2. To get more specific, look at the robot's legs around 0:09-0:16. They don't seem to be moving normally.
I don't have professional video analysis chops, but I'd put some money on this being fake.
Happy be to be proven wrong, though.
EDIT: It appears I remembered this story incorrectly, and posted a link without reading it. I retract my first statement. I'll leave the link for posterity, though.
[1] https://www.theverge.com/tldr/2019/6/17/18681682/boston-dyna...
Your link says nothing of the sort.