Do note that this article doesn't claim or mention that the brain is a quantum device. We have evidence that the mechanism of photosynthesis and possibly the magnetic-sensing cells of some animals are not explainable classical mechanics, and that's no big deal, we know that the classical mechanics is a rough approximation and QM is also required to explain why a bunch of chemistry works that particular way.

However, we don't have any reason to suppose that quantum computation is involved or relevant in any of the processes mentioned in the article, and we don't really have any evidence or reason to suppose that the brain is a quantum device. It might be one, but for all that we've seen until now it might as well be an electrochemical computer, that is sufficient to explain all observed phenomena.