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antonmik said..don't make me laugh 8-9 knots is not an extreme light wind. Here are 6-7 knots this is a real extreme light wind
The guy who posted the video said (in the yourtube comments) it was 5-10. I'm assuming the 5 is where he wasn't planing. You are comparing someone pumping a 12 vs someone gliding on a 9. Big difference.
IndecentExposure, I'm a bit at altitude with the hot and humid summer air, it's pretty thin* but you are another whole level!

*Our density altitude in the summer can be 4500ft.