Interesting link, but you're missing the point. The website even misses on their points. Most of the bad examples fit under an acceptable contrast ratio, by the standards given in their research, and even their good examples are not pure #000 or #fff. The w3c states that a minimum level of 3:1 works for people with 20/20 vision and 7:1 achieves the Triple-A standard. To show you what it looks like.
Or not: http://contrastrebellion.com/