Trump is narcissist. Trump is grandiose. Most of what the psychiatrist said is correct.
But the psychiatrist failed to mention that these traits have worked for him. Many people who harbor these traits can't hold jobs, lose friends and significant others, and are desperate and alone. On the other hand, Trump has used these traits to flourish--he has used these traits to his advantage. It works for him.
The psychiatrist should have added in the above "disclaimer." Harboring these traits could lead to a positive or negative outcome--for Trump, it's largely worked.