This seems like defiance of the laws of physics, but it just needs the right shape and size of sail to trap enough of the air-mass blowing in the wind.
The resulting transfer of momentum can propel yachts to impressive speeds, especially if friction is minimised – some sleek catamarans can achieve 80km/h using 35km/h winds.
If I owned a Yacht, especially one of this ‘calibre’, the last thing I would be concerned with is ‘windspeed’. I would be more concerned with where I would venture next.