Yes, results can be achieved through years of doing nothing but weight training such as in prison, but when it's a persons profession, as is the case of Vince Taylor, there is no reason to believe they would voluntarily choose to take a path of disadvantaged nutrition.
The only logical conclusion that I've come up with is that the author of whatever article this was from took the quote completely out of context.
Like, say Vince was dieting down, and he talked about how a couple days where he'd only consume 1-2 whole meals a day, and the rest of his calories would come from low-calorie MRP's or something.
Then, the author writes an article exclaiming "Vince Taylor says he only eats 1 meal a day!" just for the sake of sensationalism.