Not always possible because of differences in the groups.The easiest way to achieve that is to be seen to be reflecting the population in employment and delivery of services.
It's racist.So if a person from ethnicity A and a person from ethnicity B both apply and both meet the minimum requirement, but person from ethnicity B meets the preferred requirement in order to meet or maintain targets, they are employed.
What’s the problem?
I don't usually bother to read Coathanger's posts but, having seen this extract, I see how the chip-on-the-shoulder brigade try to change the rules to suit themselves.
It seems to me that, in order to legally employ the 'type of person' they want, the answer is simply to lower the 'preferred requirements' until they meet the candidate's abilities.