The blog post points out that the test was developed by a French teacher and that this teacher made the errors. It also gives some complete B.S. about how the media is thorough in its research, which it clearly isn't.
Having a professional create the test was a good move for TVA. But not having the test verified by another professional was where they failed. It's relying on a single source to verify that something is accurate. This is one of the first things they tell you in journalism school not to do.
But TVA wasn't concerned too much with accuracy, because they didn't take it seriously. Just like the other tests given in the media, it was nothing more than a gimmick to fill air time and possibly generate ratings. Infotainment that had nothing to do with quality journalism.
Until the media start taking these kinds of tests seriously and having them properly verified, the public can put about as much faith in them as they have in the spelling accuracy on this blog: not mcuh.