Yes, and dually, demonstrating to people that their code insertion filters are inadequate. You may know better, but there's still a lot of people in the real world who try to "sanitize" Javascript with thing like "Remove all ()[]'";" and think they're security masters whose code is unassailable.
That last bit isn't snark; it's my personal experience.
As mentioned in the article, there are filters in the real world that will be penetrated by this.
