I think the author has confused himself into thinking that just like a computer has discrete physical components called RAM, CPU and Hard Disk, the human brain

I think the author has confused himself into thinking that just like a computer has discrete physical components called RAM, CPU and Hard Disk, the human brain at some physical level has similar components. However when neuroscientists are talking about these terms they are talking in logical terms and not physical terms. The 'chemical changes' and 'rewiring of brain' that the author thinks are the reality of how the brain works are still compatible with the logical way in which computers work. The memory and computation and storage are distributed across large collection of neurons in the brain yet they logically conform to computer design principles.