I didn't even have to read the article, to determine that those numbers are based on masses of raw material, rather than masses of active analytes. This is clear evidence that the science means nothing to the prohibitionist industry, which is profit-driven, just like the "drug dealers" they go after. They are bottom-feeders, regardless of which side of the law they are on.
That being said, doing bulk is never a wise decision. People post all the time about how to go about doing bulk; I don't enable them, because of the aforementioned premise
(bulk = profit, for both sides). greed = bad karma.
"Nothing is true, everything is permitted." ~ hassan i sabbah
"Experiments are the only means of attaining knowledge at our disposal. The rest is poetry, imagination." -Max Planck