1. If the CNN article was written not as an obvious opinion piece, which it seems, but rather a ploy to get page views, Tate did the same thing by posting it on this site.
2. To say that Nas could be considered the greatest lyricist for hip-hop is not a ridiculous statement in the slightest. There isn't a huge enough gap between the quality of hip hop and "rock" or whatever music to make it ridiculous that the greatest of one genre could be better than the greatest of another.
It has nothing to do with the best of one genre being up against the best of another genre .... it has to do with ignoring genres and looking at the writing
as a whole. The music and genre doesn't matter. The writing does.