Anyone who falls for that Jagex propaganda is quite naive and foolish. If you read their posts, all they say is that Rule 12 has become a "priority". What kind of bullshit is that? Was Real-World Trading not a priority before? This is simply Jagex trying to scare buyers away, and sure, it's worked temporarily. The fact of the matter, however, is that there are no new methods of detecting Real-World Trades.
Temporarily, the buyers have been scared away somewhat. Along with the problems with e-Gold, this has driven GP prices down. However, Jagex will have to continue making these posts weekly to continue the effect, and that is likely not going to happen. People will soon realize they are empty threats, and will continue to purchase gold.