No problem, let us try and explain.
Intelligence is a process in which "you have thought over a problem at length" (this is also our good old Einstein, paraphrased).
What is that "thinking"?
You have taken a piece of your world model (the piece which subjected to your investigation), made mental experiments on it, you have criticized, _criticized_ the possible statements ("A is B") that could be applied to it, you have arrived to some conclusions of different weight (more credible, more tentative).
For something to be Intelligent, it must follow that process. (What does it, has an implemented "module" that does it.)
Without such process, how can an engine be attributed the quality of Intelligence? It may "look" like it - which is even more dangerous. "Has it actually thought about it?" should be a doubt duly present in awareness.
About the original post (making its statements more explicit):
That "module" is meant to produce «insights» that go (at least) in the direction of «true», of returning true statements about some "reality", and/or in the direction of «subtle», as opposed to "trivial". That module implements "critical thinking" - there is no useful Intelligence without it. Intelligence is evaluated in actually solving problems: reliably providing true statements and good insights (certainly not for verosimilarity, which is instead a threat - you may be deceived). Of two Authors, one is more intelligent because its statements are truer or more insightful - in a /true/ way (and not because, as our good old J. may have been read, one "seems" to make more sense. Some of the greatest Authors have been accused of possibly not making sense - actual content is not necessarily directly accessible); «/true/ way» means that when you ask a student about Solon you judge he has understood the matter not just because he provided the right dates for events (he has read the texts), but because he can answer intelligent questions about it correctly.