I specifically and mindfully added those words because everything is really an open research question. Would you rather I dissembled a false sense of confidence? If anything, you're stating your vague case way over-confidently. Turing-completeness is broad and nonspecific. Doing "some computation" is an obvious statement that doesn't add any information. The human brain does not seem to have time limits when it comes to thinking about what to say, and further we don't understand enough about neuroscience to make statements like that. Like I said, these are all active areas of research; the jury is still out on whether any specific approach will be the breakthrough.

EDIT (reply to below): in general these statements are either vague and nonspecific, or perfectly correct and non-informative, comments that don't have much to do with my original point.