I think the article is useless as well.
BUT, personality DOES play a large role in determining the effectiveness of someone as a leader.
More to the point, personality and the discernment of its characteristics and consequences is an intrinsically subjective thing. You will not find clearly actionable data nor systematic rules for figuring this stuff out.
That subjectivity doesn't stop people from trying to quantify this stuff, like for example, those insipid HR-driven DISC personality surveys and workshops. Some folks dive into minutia about Myers-Briggs classification. There's grains of truth in all these approaches, but it never works the way it was intended. HR departments and individuals aren't psychometric professionals, and even if they were, what they could actually use this for in a workplace isn't at all clear even in the best case scenario.
IMHO, the way you identify a destructive leadership pattern is by having experienced it before (as well as its opposite), by being mindful of your interactions with others and with organizational politics, and being self-critical of your own reactions to it. None of that is easy, It can't be learned in advance. It takes experience, trial and error.