Where do you draw the line?
Fooling a recognition system with slight modifications is one thing, but what if one goes the other way and presents something so weird that even humans can't recognize it. Take the article's mention of beer bottles and wine glasses. Suppose one submits an artfully-grafted picture of a beer bottle but from the neck up, seamless, is the top of a wine glass (like a funnel bottle). Now you're getting abstract, and binary computers get into trouble trying to quantify something that defies quantification.