Those sources refer to ratings for Erin Burnett's ratings for her individual show.  Yes, they mention that ratings for other CNN programs are also low.  I don't think that's relevant for this article, but if you do, include it.

This ratings record she broke is certainly an important part of her career.  It is the main noteworthy fact about her job, which is the most important part of her life.  A couple of you apparently are maintaining that info about Erin playing field hockey and lacrosse and a joke about camels she made are crucial info to this article, but her show breaking a 20-year ratings record is not important.  Get real.  Your judgement about relevance is obviously poor. This info will stay in this article.  Period.