I'd expect the same deficiencies to show up downstream in grain and soy fed cows, pigs and chickens. For meat eaters, that's an argument to spend more for grass fed beef, lamb, buffalo, and pastured chicken eggs.
I don't know if such regenerative agriculture can scale up enough to feed everyone, but it can become a lot more affordable and accessible than it is now.
It can't scale up if it still needs to be produced in the same quantities. It takes a lot of farmland, about 80% in fact, to produce feed for livestock (especially for cattle) even with calorie-dense feed like cereals. You'd have to cut down a lot of forest to make pastures.
Permaculture techniques can often support significantly greater density than monoculture, but are often not conducive to machine harvest, so end up being much more labor intensive
I don't know if such regenerative agriculture can scale up enough to feed everyone, but it can become a lot more affordable and accessible than it is now.