I find it more disturbing they consider diversity on a pseudo scientific race definition than the supposed lack of diversity. What if in those they call white, many are women, many are young or old, fulltime or partime, idealists or pragmatists, some kind of attributes that could actually matter for writing ? I d be more worried if all journalists are students of the same school of thought than if they were all blue-skinned.
And I say that myself as a minority where I am (happen to be white-skinned western europe pigment variant, italian hair-colored, northern continental medium sized, but live and work in China...) where Im still probably graded as part of a non diverse "race" in my company's corporate diversity index :D
And when the government in China asked me my "self reported racial origin" last census, I said "Other: Normandy", not sure what exactly they want to mean by "westerner" as opposed to "vietnamese" in the multiple choice combo box...