Pretty good, overall. The note at the end was basically just spelling out the nature of the father-son relationship in a way that felt out of place. Furthermore, this is basically just another intro piece for yet another character.
But, upon reflection, that's kind of why I like this; Desai is a character, rather than an author avatar.
Reading this, I got an idea of a father's pain as his son pushes him away, I saw the frustration and horror creep in between the lines of the official letters, and I understood at least partly why someone would choose to betray the Foundation like this. He feels like an organic person, rather than someone who was cobbled together from distinctive attributes, which, ironically makes him infinitely more memorable than most of the newly-introduced characters for this canon.
+1