You would be wise to leave the clinical evaluations to the professionals who, for very good reason, do NOT diagnose people they have not personally evaluated in a clinical setting. If I had a nickle for every incorrect comment about my conditions that I've heard from "untrained laymen" (or quack docs, for that matter) over the years, I'd be a very wealthy woman.
When "untrained laymen" open their mouths about things they don't fully understand (much as the writer of the article didn't understand, as they claimed there is no "cure" for the disease- there is no "cure" for genetics), they run the risk of further stigmatizing mental illness and contributing to the wall of falsehoods that the average person "knows" and believes about serious mental disorders.
Mental illness is a serious and nuanced subject- many people who are ill are too sick to realize they are ill in the first place. Seeking treatment might be beyond their capability, even when presented with credible evidence of their disorder. More often than not, this is the result of biology. While the exact mechanism for onset of NPD isn't known, countless studies of twins point to biological factors as the source for personality disorders. The disease isn't a choice.
Trump is an unapologetic racist. That is a choice.
Trump is an unapologetic misogynist. That is a choice.
Trump is an unrepentant liar. That is a choice.
Trump is a bully. That is a choice.
Trump is a con man. That is a choice.
Imo, nail him for what he chooses to be, not what the fastest derpy swimmer in his daddy's sack made him.