In the first article linked by the one you posted, it is very specifically mentioned:
We acknowledge that these findings, though consistent, aren’t proof of a direct relationship between diversity and financial success.
Second article leads to a 404 error.
The APA study cited by the third article also leads to a 404 error.
The study done by the fourth article is about stock-picking, not diversity hiring.
The fifth article is interesting in that the “diversity” is age-related rather than being sex or race-related. In which case, the article seems to indicate that older people seem to have more knowledge and experience than younger people or that younger people seem to assume that older people have more knowledge and experience.
Yeah, go figure?
Article six says, “Not every diverse group beat the very able groups, but some did, because they were open to a range of solutions not considered by the very able students.” So they admit it doesn’t prove anything.
Article seven doesn’t account for any conflicts of interest inherent within the paradigm that claims diversity as being the greatest good.
Lastly, the article you posted has a huge disclaimer at the very end that you should read.
In fact, maybe read what you post before you post it. Seems to me you just googled something to try to prove me wrong and didn’t do due diligence in actually reading any of it.