The study they're apparently basing this on, done in 1993 by Harvard, defines a binge as 5 drinks per hour if you're male or 4 if you're female, and apparently "in a sitting" for the CNN report was corrupted from "in a row", id est, uninterrupted by changes of locale, significant amounts of time, non-alcoholic beverages, and/or food.

"Have you had five drinks in a sitting" and "have you had four drinks in a row in an hour" are two very different questions.