> I could name at least a few here in Germany from the top of my head, all of them commercially successful (tough I admittedly do not have calorie production figures for those and am not sure if they exist). But I'm not sure why the example of his farm warrants so much skepticism.

Because if it was that good, I'd expect to have been seeing all kind of articles about the massive revolution in agriculture. If there wasn't some kind of catch, why isn't it seeing wider adoption?

As far as what counts as "commercial success." It'd really have to be something that can compete with commodity agriculture to be a solution. If it's a "commercial success" because it's some boutique thing that can charge 10x commodity prices to make up for 5x costs by selling to self-consciously "ethical consumers" and elites by marketing its good local green permaculture vibes, then I don't think it will be anything but niche producers.