Hm, looking at this breakdown of degrees at Duke...
https://www.collegeraptor.com/colleges/majors/Duke-University-NC--198419
... sociology seems to be about as popular as anatomy or environmental studies, and more popular than chemistry, English language, or History.
Now, I am not surprised at ALL if the major sports teams have fewer engineering folks and more "soft sciences" folks (although there have been ball players who were in engineering and such) compared to the student body in general... the Duke student body is a very specific group, and there is no great surprise that Public Policy and Econ and Biology and CPS are more popular, given the type of people those degrees attract. I haven't seen anything that indicates that sociology is a sham degree, though, or anything that indicates that Duke athletes aren't also being held to certain standards as students. As I said, in my personal experience, the opposite is true.
I have to say, I don't think of Duke holding itself up as *particularly* sanctimoniously, when compared to other comparable academic institutions, except in that Duke athletics are far more successful than those comparable academic institutions. I DO think that Duke values the education part of it student-athlete more than SOME schools that are as famous for athletics but not for academics; I mean, just look at Duke's basketball APR scores over the years... it is usually very high, especially compared to some less academically-oriented schools. And obviously there is a level of rigor across Duke classes that is likely a bit higher than at some universities. My guess is that there is an approach that Duke athletics takes towards academics that might not be the same as, say, the approach at South Carolina, but I wouldn't know about S.C.... I can only speak for Duke.
BTW, about classes not at Duke yet still getting credit; that is common. I took two science courses at a local community school between my freshman and sophomore year because... well, because I took some science classes at Duke and they whipped my ***, so I figured I'd get a few credits in a much easier environment. It was pretty simple, and my grades were noticeably different. This isn't uncommon, and it certainly wouldn't be difficult for a basketball player to do a few hours of work a week, which is all that classes really require at MOST... and that's if you want an A.
And btw, UNC STILL holds itself up as some paradigm of education. Such is the delusion of UNC folks.
Anyway, not really here nor there. There isn't really going to be factual information about Duke cheating, just as there isn't factual information about nearly any school cheating. If you hate Duke, you'll likely see stories and assume that there are clear malfeasances... if you like Duke, you'll likely see stories blown out of proportion and assumptions being made.