In the screenshot the ad blends into the rest of the UI instead of being clear that its an ad...And its prominent placement in the UI makes it very clickable. Following your logic shouldn't it remain in the same place but be more clear that its an ad so that people are not confused that its part of the product? This would have the result of being seen but not accidentally clicked.
First: it may not be quite so apparent from the screen shot, but the ad is framed to make it distinct form the rest of the app. Going further might well do more harm than good, as it could disrupt sight lines and make the UI garish regardless of ad content. The ad itself also draws distinction with the surrounding widgets by employing a different font, a different icon style, a different background, and a different icon size.
As the article describes, people aren't misclicking because they've looked closely at the ad and mistaken it for an application function. Misclicks are predominantly people who really aren't sure what they are clicking on, don't know they are clicking, and/or didn't intend to click at all.
Either way, in practice Yahoo's optimization efforts if anything create incentive to minimize misclicks, not the other way around.
