The mod is purely visual. (You found it in the "Texture & Models" section)
Otherwise it would be a major hack/cheat, hehe.
You'd have to actually hack Wargaming servers to get things for free like that.
This mod randomizes camouflage on your tank and on all other players tanks, just to change their looks.
It does NOT add camouflage value, you'll need to mount your own camouflage that you already bought for that to happen.
And judging by the screenshot, there's no camouflage on the HULL of that tank, which means that it won't get camouflage rating. (The only camouflage I see, is the two on the turret/mantle, unless those weird green dots are supposed to be the hull camo).