You seem to be missing the point here. Regardless of which way the wind blows, that windmill can only rotate one way and generate power. If it's rotating the other way, then it's not a net source of power, which makes it perfectly useless.
The blades also look like they might be tilted outwards, in which case it is moving in the correct direction.
And I don't think I am missing the point. When you consider the simplicity of the gears inside a windmill, they're not that complicated. Nor do I see how moving it in the opposite direction would cause any loss of power. It's just turning the gears the other way, turning the grinding stone the other way. How does that result in a loss of power?