I cannot recall hearing the man's name before, so after reading the article, I did a quick Google and read one or two more of his articles. He writes in a lot of different places!! It seems he is first and foremost a journalist but owns a lot of land.
If as he says he is farming unsustainably, and I agree that he is with his permanent arable, then he should cease doing so. He obviously has no thought or care for future generations, only his own profits. That is stewardship at its worst. He should stick to writing and let someone farm the land who does care for the future.
I am not an organic farmer, never have been and never will be. I use grass breaks grazed by livestock because I think they are essential, and use as much FYM as I can produce, but also buy inorganic fertilisers, and sprays when the occasion warrants it. I believe my system is sustainable. I also believe there are other sustainable systems.