Your article says this:
High black population does not mean high voter turn out.
Let me explain it for you. The key is the first sentence. Moderate as in, not extreme, aka far right or left. Diverse in the sense of not a monolith, there were right, left, center etc.. however they leaned left, some where right of course but that's expected. When looked at as a whole they were left leaning but showed diverse opinions. I do think its a poor summary whoever chose those words tbf.
From the actual study:
In a 2 × 2 MANOVA and subsequent ANOVAs with the four scales of the multi-dimensional questionnaire (economic libertarianism, liberalism, conservatism, socialism), no significant main or interaction effect emerged, except a significant interaction effect of giftedness and sex for conservatism. Specifically, non-gifted men showed higher conservatism scores than gifted men, whereas gifted and non-gifted women did not differ significantly. The results from supplementary Bayesian analyses were in accordance with these interpretations
Non-gifted men showed right leaning tendencies, which I can confirm from experience. Even the lunatic fringe rights don't come across dumb, they come across mentally unstable. Women didn't differ, gifted or not.
I mean this whole thread was a troll but I think this is a fact. Do I think that is all that matters? no. EQ matters and so does mental stability amongst other factors of which I have zero clue wrt political leanings.