I think Wolfram may be ignoring what we already know of brains with more neurons than most have. We call them "austistic" and "adhd".

More is not always better, indeed it rarely is in my experience.

I suspect this is not relevant given the broader picture of the article: In general, species with the largest brains/body-mass ratios are the most intelligent. It's a reasonable assumption that this principle holds for brain/mass ratios higher than ours.

Who told you people with autism or ADHD have "more neurons" than average? That's not correct.