I have never heard of this but theoretically i dont see why it wouldnt work to remove the chlorophyl out. It may also remove alot of flavor but not 100% sure about that .
You can make garbage concentrate with garbage indoor just as quick as garbage outdoor. If the material is good quality outdoor it will make a good quality extract
The difference in oil from trim/sugar leaves and fresh frozen buds is VERY noticable imho. But yeah unless you are growing it its probably not worth it