Really?
"“We probably need to start rethinking our emphasis on intelligence,” he said. “This isn’t to say that we should throw intelligence out,” he cautioned, “but we need to pull back on thinking that this is the only game in town.”"
When the author comes up with an asinine statement like that, one should be vary afraid. FYI Poropat and Duckworth are focusing on a single trait, they're substituting "grit" for intelligence. So no, they are not trying refute any single trait theory, they are promoting one, i.e., have education focus on grit rather than intelligence.
Perhaps you should have read the article.