I can't access the page but I ve heard about this before and I honestly think it is BS. I read an interview with real chinese farmer who farmed gold for money and what he was earning was about 200$ a month for 10hrs per day work! If I find that interview again I'll link to it but the whole thing is not as easy as it looks.
Dalebu - thats probably because he worked for a company like IGN that employs people dirt cheap to farm gold. A lot of the people doing it independently (usually with bots or phishing/keylogging schemes to steal peoples accounts and other unsavory stuff) make ridiculous amounts off of it. It can make a ton of cash if you do it properly.
It is not worth it. They get you sometime, they always do. Then you can take a picture with all that money you "made".