It is of course true that if GPL code was used then the resultant product must be GPLed itself. I have no contention with you there. But as far as hoping that the company gets sued into oblivion, your indignation may be overzealous. The situation is not necessarily that simple. Imagine that you own a company. Maybe it's a large company or maybe it's a startup. You hire some developers to build a project for you. You invest in development, marketing, legal, production, etc. You may have put thousands of your own hours into meticulously guiding your beloved dream idea. Everyone does their job adequately except for one or two rogue developers who steal GPL code. Maybe your developers are incompetent and they steal to give the illusion of competence. Maybe they are ignorant about the terms of the GPL and they aren't ethical enough to bounce it off of the legal department before they take the code. In any case on a team of ten, dozens, or maybe hundreds a couple of guys download some code. Nobody knows about it. They project reaches prime-time. The owners of the copyright notice some similarities and investigate it. Now you, the owner of the company who has tried to do everything by-the-book, are suddenly accused of stealing code, you're flamed on the internet, you're under legal threat, and you're told that the hundreds of thousands or millions of dollars that you've invested are now potentially wasted because you need to give your software away for free. This could force you to breach other contracts and so it may not even be possible to legally satisfy everyone.
I haven't read the article. I know nothing of this product or of this company. In any case, I think that the anger may be a little exaggerated because the owners of this company could be victims along with the owners of the GPLed code. It could come down to a couple of unethical and/or ignorant developers.