Whats your actuall claim? That methane release is irrelevant for global warming? Or that beef production excluding methane is not more co2-expensive than plantbased protein production? Or both?
Anyway, feel free to make an actual argument. Both of the claims above of is contrary to established science, so you must say something more than 'you are wrong'.
Methane traps 81 to 84 times more heat than carbon dioxide over a 20-year period, but drops to 28 to 30 times more heat over a 100-year period.
Cows create methane (or rather the microbes in their bellies) from co2 and hydrogen, they do not 'capture' it from somewhere. More cows -> more methane, which heats the world more than the co2 used to create that methane would have heated the world.
The whole of life, plants and animals - depend on the "cutsy" parts.
Basic atmospheric science.