I dont know, but what i think what they were trying to say is if you meet those requirements and you're aiming at the sweetspot for an item, you are more likely to get that item. however I haven't noticed any change since the patch. i am R25 miner mining in GR3 area Bloodshore. I Aim at the limonite spot, and still get pyrite, copper ore, etc, and occasionally a limonite. 160+ Vit, R25, GR3, and All gathering clothes with proper rank tool. I don't sense much of a change here.