That's a pretty authoritative statement that seems to chalk it all up to personal moral failure without much substantiation, it also goes directly against medical consensus and neuroscience. If you'd create a pie chart taking into account all the factors that play a role in addiction, heritability/neurology, psychology, environmental factors, and mindset, then mindset would generally be the smallest part, so the scenario that mindset would even be larger than the sum of all those other factors is pretty outrageous. Biological factors alone can roughly account for 50% of addiction. Mindset should also not be conflated with psychology, they're not the same. And lots of high-performing individuals suffer from addiction; they couldn't have achieved the position they were in without willpower and discipline.