my opinion alone on the matter of whether a duping method exists right now or not, mm based on my experiences playing D2, it was never a matter of "does the method exist", as Duping has and always will be around... except for that one time in 1.09 when they rust stormed the whole server, but generally, before and after that, dupe methods were always available, just more in secrecy and only available to a few select organizations that heavily monetized it (actual money). Every patch, every updates, something get fixed and something breaks and its not long before someone finds an exploit or a way to bug the db. The smart ones keep it to themselves and do it carefully. The dumb ones are usually the ones that win the lotto and go running telling everyone how much they made and how rich they are.
Again this my opinion based on what i've experienced. Please don't scam me.