No, it isn't. The book was written during the Great Depression. We're not in the Great Depression now. Pretty much nobody nobody is dying of malnutrition in the US and nobody is dying of pellagra specifically, because we've invented fortifying food with vitamins.

But the big difference is that the peach trees are being destroyed because nobody wants the peaches. That's the exact opposite of the quote, in which there are starving people clamoring for the food and the food is being destroyed to raise the price.