maybe they've closed these holes, but click fraud has been an issue every since the earliest days of banner ads, so I'd be really surprised if it has been eliminated completely.
That said, it's nice to see this stuff separate the slick from the competent in the industry.
Considering the pot could be somewhere in the several 100Ks per month (according to the article) range, which 'job' would that be?
This was five or six years ago, but it looks like not much has changed.