Not sure why or who said it but it makes sense i guess. Potatoes are carb heavy and low in other macros and thus seem to fit more with the foods used for backloading, being able to eat them whenever desired almost seems too good to be true haha.
As for prohormone cycles, I think it’s the opposite. People here eat carbs all throughout the day on cycle, judging by past posts. Staying gluten free though of course.