Because this looks like the footage Kaku shot with the XL-H1 a few months back but it says it was shot with the HC1.
Maybe I'm going schizo...

http://dvinfo.net/conf/showthread.php?t=54613

Kaku Ito has graciously provided a lot of video for us from a variety of camcorders. I believe the particular clip you're referring to was shot with the Sony HC1.