Just fyi, every person you listed above founded the financial company that made them rich. So they are founders and did do a startup - just not a technology startup.
"Startups are a comparatively new phenomenon. Fairchild Semiconductor is considered the first VC-backed startup, and they were founded in 1959, less than fifty years ago."
Clearly, he's referring to tech startups specifically. If you consider any small company that becomes big a startup, then Rockefeller and Carnegie made their wealth in startups.