In my experience, only consuming animal products from these farms is a bigger hassle than finding vegan food.
Here's a talk of his on Cows and Climate Change https://www.youtube.com/watch?v=4Z75A_JMBx4
From my recollected (watched that ~6 mo ago), the amount of land needed to grow food for his herd is less than the amount of land that would be needed to purchase it elsewhere, because the rotation of the animals keeps his fields fertilized and trimmed to the optimum length for fast growth. Plus, by rotating in chickens, he's double dipping a bit.
There are some people doing some interesting research into using herd animals to prep beds for annual vegetables: they let the animal graze as the seeds are starting to germinate, animals eat everything green. The germinating seeds are then able to fill the void left behind faster than anything else, because the farmer timed it properly.
Modern industrialized agriculture has a lot of issues. Other methods of agriculture can have net-negative emissions: grow all of your feedstock onsite and use waste products to produce more feedstock. If all the carbon you emit was previously captured onsite, you're only 'borrowing' carbon, not really producing it. Slightly net-negative carbon as soil is built as a byproduct. See Joel Salatin for further reading.
I think writing articles about how "You, individual, can do something to save the Earth" is ineffective moralizing not unlike Facebook posts asking to "Share this if you want to end human trafficking!" - the only tangible effect is self-promotion of the author and inflating the self-esteem of the readers who go along with it.