So this is a study about political diversity where it's specifically relevant to the organization's work. In this case, Wikipedia. I'll admit that political diversity is necessary when the "product" is unbiased articles written on politically controversial topics. But how would this affect how a software company develops products, how a car manufacturer develops cars, etc, where political diversity is not relevant?
Well, if one accepts the argument that identity-based diversity among the workforce is important to more fully represent the perspectives of everyone in society... then that logic extends to political diversity and other kinds of viewpoint/idea diversity as well.
Seems those decrying the article are often aligned with the one diversity assumption... curious why they seem to be rejecting the others.