Earlier quoted context omitted.
Not malleable enough for conversion therapy to work.
To my mind, that's a little like saying "Wow, it sure is shocking how forcible rape fails to get people all hot and bothered and learn to love sex." Conversion therapy is the opposite of someone deciding "Hmmmm. You know, I never thought about it before but now that I am in some new circumstance with people with different traits, I'm finding myself weirdly attracted to categories of people that never did a thing for…
I also would not be surprised if it increases, rather than diminishes, homosexuality. Interventions can have counter-intuitive effects.