Why would the authors say otherwise?
Additionally, why is it framed in a way that makes it seem like white people having more of an impact is a bad thing?
10 years ago if you'd told me articles like this were coming I'd have laughed. How did misconstruing the truth to further the "white people bad" notion become not just acceptable but popular? And it doesn't even stop there - the article implies that more diversity (i.e less white people) is an ontological good. How does this stuff even get published?