You have to look beyond CO2 emissions to assess climate change impact. The IPCC land use report from this past August does exactly this [1]. The associated reporting is also quite good [2].

The grandparent is right: cutting down forest to grow cattle feed is a triple whammy.

1. https://www.ipcc.ch/report/srccl/

2. https://www.theatlantic.com/science/archive/2019/08/how-thin...