Because intelligence as a single-dimensioned parameter is a myth.
You seem to be confusing the concept of intelligence with *measuring* intelligence.
Our current measure, IQ, applies specifically to the cognitive strength of human intelligence, and our ability to solve problems creatively.
You cannot meaningfully talk about the IQ of a dolphin or dog, let alone an AI or alien intelligence.
And the only reason anybody uses a single parameter for measuring human intelligence, is that the other measures and components of IQ are highly correlated, not because they don't exist.
super-human information processing capabilities
That is not intelligence, not even in thesense of current AI.
When people talk of super-human intelligence, they mean one capable of self-awareness. Something even a toddler lacks.