Hey,
I am absolutely sure that a Neuroscientist can understand how a microprocessor works, this article just shows that the'tools of neuroscience aren't apt at reverse engineering. Afterall an fMRI machine is an increadible feat of engineering, so there are plenty of neuroscientists with physics and engineering backgrounds. If you have the methods and knowledge of engineering at your disposal than you can reverse engineer a microprocessor. But these methods aren't applicable to the brain. So I'm pretty sure if the question was: Could an engineer understand the brain? than the results would be just as grim (if not worse). The point is simply that a microprocessor should be easier to decipher than the brain, since it has an intentionally built purpose. This goes to show what a needle-in-the haystack modern data-driven neuroscience is. I am pretty sure we need more theories as a compose to help us connect the dots quicker. Hope that answers your querries.