Of course it won't work if there is too little wind ... nor if there is too much wind. Like Goldilocks' porridge it has to be "Just right". Utter nonsense.
I can see a wind farm from my back window, sat out there three miles off shore. More often than not it is in lock down mode because there is too strong a breeze.
And where does our leccy come from when this marvel of green engineering, that cost more to build than it will recover in its 30 year anticipated lifespan, is not working? From a nuclear plant on Anglesey.