@kitz - No, it's just a general Safari iOS think, and for some reason it just seems a lot more noticeable on the iPad Pro with the larger screen. (Not the later 9.7" alternative product that confusingly is also called “Pro”.)
[Perhaps the iPad Pro's pixels are larger, I haven't done the arithmetic. Or it could be cowardice on behalf of Apple, worried about web designers having assumed that all iPads have the same “size” display in some sense, and so maybe iPad Pro Safari is using some odd virtual pixel scaling units. Mind you, there's the iPad Mini, and the iPhone 6S Plus, which I think has a big screen for an iPhone, not that I've ever seen one, so there are actually already a number of different physical sizes of i-Device screens for web designers to think about. (No one ever takes any notice of the W3C's definition of the standard browser's conceptual ‘pixel’ and everyone in the browser design world just seems to copy each other somehow.)]