Along with grit, growth mindset, power posing, priming, and stereotype threat. A lot of non replicating trash in psychology right now.

That link has 2 periods at the end

That article contains no evidence you can raise intelligence, and also references the now discredited n-back brain training games.

Two I know of, Sternberg's and Gardner's, both have no real evidence for. I think it's part of the difficulty when you try to come up with a model of learning that ignores the g-factor.