I don't think you're wrong per se. But people aren't "claiming" the brain works this way. People are simply stating that maybe the brain functions like this and

I don't think you're wrong per se. But people aren't "claiming" the brain works this way. People are simply stating that maybe the brain functions like this and we could adopt similar designs based on our perceived impressions of how the brain may function. We could totally botch it though and end up with an even worse computer and turns out it works nothing like the brain. Who knows. But right now many people "believe" the brain may function in the manner described.