My suspicion is that the exercise is to allocate people randomly to these groups. Not based on their actual ethnicity / inclinations. This article doesn't act

My suspicion is that the exercise is to allocate people randomly to these groups. Not based on their actual ethnicity / inclinations. This article doesn't actually contradict that, since random selection will put some in their "appropriate" category. So, either that, or the person conducting the exercise totally misunderstood it.