I'm not convinced that it ever happened.
The video is a year old.
All those quads had to be programmed to adct togethor. The entire display had to be pre-programmed.
Such technology to create that isn't here.
I think that's a clever CGI fake. Where are other videos of that event? There were lots of people there with their own cell phone cameras.
Where are other videos of that event? Shot from different angles?
The video is a clever fake.