That loophole is the fact that their law has no jurisdiction over foreign transactions. While it absolutely can put a stop to these transactions on Chinese soil using Chinese servers and Chinese currency, Chinese goldfarmers can still happily (well, probably not happily) scrounge up gold on American realms and sell it to American players. Most likely, this new law won't have an impact on the gold selling industry whatsoever. The people being impacted are those crafting their games on a model of microtransactions rather than a subscription model. Developers, not gold farmers, will be harmed by this. A game like Free Realms is no longer a feasible option in China.