I'm not arguing it isn't a first world problem. Although, I can see a rabbit trail about the nutrition of GMOs vs the nutrition of later hybrids vs the nutrition of heirloom varieties.To even be able to ask the question of whether or not GMO food -- high-yield, pest-resistant, and enhanced in nutrition -- is good or bad is strictly a first-world concern.
Likewise for romanticizing subsistence farming -- each family providing most, if not all, of their food lest they starve, laboring dusk to dawn at both their crop-tending and their paid job with no time to waste on leisure.
I don't think that proposal was subsistence farming. It isn't an attempt to "produce all the goods all or almost all the goods required by the farm family..." per websters dictionary.
It wasn't even proposing producing all the food, much less all the goods. I think you have a garden, no? Do you toil on it every moment you aren't at work? I spent less than half an hour a day on mine plus a couple of full days building a fence and a raised bed box that will both last for years. To get far more vegetables than several people could eat.