Understanding and Managing Emotions. Interesting. Too bad the author do not focus at all on HOW TO UNDERSTAND AND MANAGE emotions and the subtle and misleading assumption is that understanding and managing emotions is something that everyone can do it on the fly. Nothing more false. It takes a proper knowledge, schooling, education and training to do that. So, again, in a way or in another (and by reading the article) we must unavoidably return to IQ ergo to pure intelligence. QED.
The sample size and (likely) lack of diversity in the group is already pretty weak. Even so I found the brief part about IQ being associated with openness to experience interesting. The article is surface deep for sure but I don’t think it insinuates that understanding and managing emotions doesn’t require work/education. I think their mention of introspection being potentially linked to IQ could be related to the point you’re making here