Thats a simplification for a feel good narrative. Your source lists all land that grows anything but forest as agriculture land. Yet on large parts of those areas you cant do anything but pastures. Also, much of the cow feed isnt calories humans can process. Think byproducts of soy production. The youtube channel "What I've Learned" has a great video on it. https://www.youtube.com/watch?v=sGG-A80Tl5g

What they dont mention is the large part livestock (especially cows an chicken) will have to play in producing soil from the dirt left behind after industrial agriculture. Regenerative agriculture is the term here, with rotating cows and chickens on degraded dirt patches to build top soil.

All of this of course doesnt take away from the madness that is industrial meat production. But nothing has ever been solved by oversimplified narratives and action-ism.