If the windspeed is higher, probably the owner of the windmill will want to use it and get energy.
You're certainly right - but there are other factors as well - control of the AS350 hover in winds greater than 20 Kts (considering the boom comes out on the STBD side only), the spray pattern, etc.
Looks pretty good though, a new method for aviation to support a still emerging energy source. Good for that company to rise to the challenge. Usable both onshore and offshore.