As far as I can tell this is Alton Brown’s journey:
- “No pasta.” Live and Let Diet, Good Eats S13:E13
- “No white foods.” To the media at some point? I can’t find a direct reference, but AB mentions having said it in later episodes.
- “No white foods but Cauliflower’s good actually.” The Caul of the Flower, Good Eats S14:E21
- “No white starch.” Various web sources, approximately 2015.
Given that, I think he probably does intend to include most starchy potatoes, although I’d guess the problem has more to do with the way most potatoes are served and not the potato itself.