I'm not so sure.

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...