-ish. That list is heavier on business success than I'd remembered.
I find business and personal development to overlap so heavily that they are almost indistinguishable. People use business ambition to work out their personal issues and so a book about business success is by transitive property a self help book.
I'm trying to think of counter examples.
This is partly colored by my lens on life, which is heavily self improvement. So maybe I see everything that way.
But even a book like Good to Great which is really well researched and has a fairly academic vibe, it still has these components that are strongly self-help. The title. Hedge Hogs vs. Foxes. I think people read that book fantasizing about becoming a great person by becoming a great leader and that need for greatness was prompted by some dissatisfaction. Greatness isn't the only salve though.
(I assume you knew TH personally and so my condolences for the loss of a friend)