This can be misleading.
For instance: raising dairy cattle in lush and water rich areas with no or limited dependency on fossil water is very different than dairy cattle being raised in the desert with 90% of the food being trucked in and the cheese also being made in the desert using extremely limited fresh water.
Beef is certainly super high impact, generally but how we go about it super matters.
Seems like a weasel-y statement. Grass is a plant. Growing grass in places where it just grows itself and the animals eat it directly is disimilar to hauling grown, fertilized herbicide treated, insecticide treated, harvested, processed, trucked grains to feed animals.