QL, the term "significantly", when it is used in a scientific capacity, means that the likelihood that differences observed are greater than chance. It does not mean there is a considerable difference. And it does not mean that there is necessarily a true difference.
Also the word highly correlates, is also a scientific measure. Correlation does not imply causation.
There are laymans meaning of those words, and there are specific scientific definitions of those words.
Furthermore the project includes in it's title "the brains of men and women are subtly different", which confirms what I said, that the differences are small.

And after all this fabulous knowledge I imparted on you about scientific terminology. I must point out that the article is written by a "princess_ami" in 2006, and was posted on a teacher-student section of a website, and references 6 articles.