The bits about the brain using quantum computing are only theories. TMK there isn't any evidence of these theories being true or false.

I would hesitate to use the term 'spot on' when discussing something we know so little about.

What we do know is that by 2030, a standard CPU will be doing somewhere in the neighborhood of 10^19 computations per kw/hr. That capability, presumably on a single chip, will rival or exceed the brain's computational ability, perhaps by an order or two of magnitude.

What we do with that horsepower is up to us coders. Maybe we'll code up a brain. Maybe we'll figure out how to sell you soap faster.