This article starts out by defining bullshitters and therefore bullshit as: "‘Bullshitters’ are individuals who claim knowledge or expertise in an area where they actually have little experience or skill. "
They at least somewhat remedy this by mentioning the better partial definition used in `On Bullshit` which is shared with the word "humbug": "deceptive misrepresentation, short of lying, especially by pretentious word or deed, of somebody's own thoughts, feelings or attitudes”"
The important difference is that bullshit is not lies, and you do not have to "have little experience or skill" on a topic to spread bullshit on that topic, all you need is a disregard for the truth, in favor of whatever is convenient to you which could overlap with the truth or not. In this way this definition is almost directly in opposition to Frankfurt's which makes me think this paper is a bunch of bullshit.
edit: Frankfurt's own words on his definition of bullshit: https://www.youtube.com/watch?v=W1RO93OS0Sk&feature=youtu.be...