What is the difference between fruit teas and pure fruit teas? In this Livestrong article they make a distinction between "fruit teas" and "pure fruit teas". The only difference i picked up on is that pure fruit teas have more sugar. But dont fruit teas also have sugar? Im confused.
Teas made with fruit and herbs, or fruit and tea, are often referred to as fruit teas. Teas made with only fruit would then have to be called pure. However a quick look online suggests that "pure fruit teas" also includes some of the former.

The article you link seems to use pure to mean "not containing tea*, as it discusses caffeine quite a lot. The sugar aspect is probably a distraction as even a fruit tea made by soaking dried fruit in hot water can only deliver very little sugar as the total weight of the dry tea is small and most of that is discarded.