Have you ever clicked a Wikipedia citation? Half they time they don't support, or even contradict, the article's claims. Groklaw isn't Wikipedia, but they idea that an article with citations is infallible is ludicrous. People misrepresent, either intentionally or accidentally, what they've read all the time.
I don't think they are claiming that at all. They are questioning Groklaw's unabashed partisanship. The thing that I find utterly absurd about these discussion is the partisanship that goes on. The Google and Android faithful are particularly bad in this area. They will call articles that disagree with their world view biased, yet an article that does is undeniable and unquestionable.