How was evolution able to get "100 billion neurons and 100 trillion synapses" functioning properly if it would take an intelligent person 3 billion years (according to this article) just to make a map of it? We're not even trying to build the city, just make a basic map of it.

This article seems a little bunk that we can't map and fully understand our own brains much faster. Evolution is effectively an unintelligent process, so how can it take us several billion years to understand what a blind and unintelligent process has given us?