I highly doubt this argument about the agricultural suitability of different lands holds up under scrutiny. I’ve seen someone grow a small food forest on top of a layer of manure that was spread on an abandoned parking lot, in midwest climate conditions. We don’t need the ‘viability’ of what can be grown where, being dictated by modern industrialized monoculture agribusinesses, since those practices are part of the problem.

And again it comes down to the possible and practical part of the vegan definition. I don’t live in Mongolia, so I’ll leave it to Mongolian vegans to determine what is and isn’t feasible.

This is just basic whataboutism.