I think science might be overstating it a bit. There are some indicators for some things. For example the first article unfortunately doesn't include a link to the actual paper, so we don't know what tests they used on the groups. I am willing to bet that for specific problems, qualification trumps diversity. For example, to build a new nuclear reactor, putting ten nuclear physicists together would yield better results than 10 random diverse people.

Also, seeing as recently a major share of psychology papers has been found to have serious methodological flaws, I would take this one with a grain of salt, too.