Look at what he eats; eveything fried, mcdonalds, etc...plus he NEVER paid attention to his diet, hence must be a genetic freak.
Probably yes.
But as long as someone eats just above their baseline, they can add good mass regardless if the actual food = shit. Especially if they are young, with good genetics (good, not necessary great). Meso started pretty young and has very good genetics.
Why do Debussey say this? Because he has slowly added weight every year, thus, he has probably eaten just above baseline for years.
The actual foods you eat = not that important. Calories = much more important. Controlled calories with crap food = ok.