The author’s purpose is to demonstrate how to do this in R, and is upfront on how this is purely for academic exercise since he is comparing an op-ed to tweets.

The author’s purpose is to demonstrate how to do this in R, and is upfront on how this is purely for academic exercise since he is comparing an op-ed to tweets. Much of the article is dedicated to analyzing how the analysis failed (it ends up recommending that Trump wrote it largely because of the presence of Russia in both that twitter account and the op-Ed) I still recommend giving the article a good scan.