Over 90% of diabetes is type 2: it's the classic metabolic disease. Noting down the exact type adds complexity to be honest. The are other forms, such as type 1, MODY or even insipidus and explaining all of them is another topic and they are comparatively rare. It's a bit of a stretch to call out the journalists work ethic as lazy. That said once specifying "type 2" wouldn't hurt but it's not necessary either.