While empathy is the ability to identify and empathize with another person’s emotions, in the case of a narcissist, the ability to recognize emotions may still exist, but there is no stage of empathizing with the other person; therefore knowledge about emotions is not a strong driver for behavioral changes.
It’s a myth that narcissistic people are unable to develop empathy – it’s possible. All the tools that foster this can help people with narcissistic traits develop the ability to empathize.