I think there's no reason to doubt the viability of 'super-intelligence' though I wouldn't really call it intelligence. There's just so much in so many fields, and humans can only hold a tiny percent of all knowledge in their head at a single time. There's likely plethora of 'obvious' dots we're failing to connect simply because nobody has both of them in their pool of knowledge.

But that's more like super-knowledge-connector. Intelligence would require, at the minimum, be the ability to discover/create things that don't logically follow from anything else. So for example - advancing some esoteric field of mathematics by connecting things in a previously unexplored way = super-knowledge-connector. 'Inventing'/discovering mathematics from nothing = intelligence.