The analogy being that accelerating superintelligence should be observable in human corporations. Lots of clever brains in a building = greater than human intelligence right? Well, sort of, but not really at all. The greatest problem with this idea is the extreme limitation of bandwidth between humans. Reading, writing and understanding are such immense bottlenecks of information exchange and utilisation that anybody hoping for any speed up of intelligence from putting a large number of people together just won't get any kind of scaling ramp-up of processing power. This is proven by the fact that if you put 100 laymen in a room, their ability will not out-compete 1 expert. Or alternatively, put 100 Down Syndrome sufferers in a lecture hall with 1 person of average intelligence and teach them some business. Give them a year to come up with a product. Who wins? The Down Syndrome Corporation with their potato powered potato maker? No. A large number of stupid people does not equate an intelligent person. Excuse the coarse analogy there, but it's a simple and shitty lesson of harsh reality.

A single great brain alone is much better. The information can whizz around unimpeded by those bottlenecks, so an augmented single mind would conceivably be superior to an unaugmented single mind, and would scale. Consider the performance of say a person relying on their memory to sit an exam, compared to a person with access to the internet. It does not take a lot at the level of a single mind to make it vastly more powerful at particular tasks.

But at the level of single human brain, you're still dealing with a neural network that has been crafted by the energy scarcity of available food. It's such a wildly unoptimised computer for an age of energy abundance like ours that it's primed for further investigation and improvement.