the TLDR of the article is that if you (for example) are struggling with focus, a strategy that is basically telling yourself to focus (while loud music is playing around you) will not yield as much success as removing distractions (turning off the music) in your environment, then trying to focus again.
the efficacy of the two strategies is dependent not entirely on ones fortitude, rather ability to craft an environment that plays to the strength of will, so to speak.