That was my first thought as well, but later in the article they mention a different case where the person in question had friends post the flagged content and other friends flag it.
My personal guess is that Facebook moderators are not biased as a whole, but individually. So when someone flags a post, the decision depends on the biases of the specific moderator. If that's the case, the effect could be damped by having multiple moderators review everything, but that also multiplies Facebook's cost, which they probably want to avoid.
My personal guess is that Facebook moderators are not biased as a whole, but individually. So when someone flags a post, the decision depends on the biases of the specific moderator. If that's the case, the effect could be damped by having multiple moderators review everything, but that also multiplies Facebook's cost, which they probably want to avoid.