The video is misleading. After it's twirled, it appears to speed up, but that's a stroboscopic effect of the video frame rate. It's the same effect that makes wagon wheels appear as if they are rotating backwards in movies and videos.
This perforated structure is somewhat of a two-edged sword. The perforations allow it to respond to blowing, but they also have more aero drag than a solid top, and thus a shorter spin time.