Straight out not the case. lots of animals are on farmable land. Also animals eat lots of our crops eg 80% of the worlds soy. Here’s one (of many possible ones) reference stating that we would only need 25% of the current agricultural land if the world went vegan. https://www.economist.com/graphic-detail/2022/01/28/if-everyone-were-vegan-only-a-quarter-of-current-farmland-would-be-needed
your economist article obviously relies on poore-nemecek 2018, which is a paper i wouldn’t trust to tell me the CO2E of CO2
animals eat lots of our crops eg 80% of the worlds soy.
the vast majority of the soy eaten by animals is the waste product from soybean oil production. that’s a conservation of resources, and it’s a good thing.