It doesn't really even make scientific or math sense. Why? Due to why\how wind exists in the first place. You could completely block or "use up" 100% of the wind a windmill height, but it wouldn't effect anything at all for airspeed a km away. It's much the same way that you can have a leaf blower shooting out 300km\hour wind, but not feel it the slightest bit from 10 meters.

Air movement is constantly having to have energy fed into it in order to make it go anywhere. This is from uneven heating and air going from high pressure areas to low pressure areas. It isn't really made from the wind that's already moving around. If this weather guy wasn't actually just making a joke, he must be a terrible meteorologist for having such a poor understanding of something that should be directly in his wheelhouse.