Confirmation bias can be a huge problem but I'm not sure the methods outlined in the article do much to prevent it. For example, the (guest) author indicates he relies on the given blog for a source of unbiased information and then goes on to say that the blog often links back to his own website, to articles that he has found to be his most useful and informative.
He then comes to the conclusion that this demonstrates the quality of the aforementioned blog. Besides being circular reasoning, is this not a source of confirmation bias in and of itself?