Take that number and at minimum ADD the cows to it. It's not like they feed of thin air while they live.
In addition to that, every step up the food chain requires 10x the amount of energy so for every kg of beef produced you need equivalent of 10kg plants just to raise the cows. It's not like the cows feed freely in the grass and carefully avoid stomping on insects all the time, this is often also harvested with machines killing rodents exactly the same way, just multiplied by 10x.
Meat eater myself here, occasionally and in moderation, but at least i'm not making up nonsense about rodents to feel better for myself.
Edit: To add some data into the discussion, see https://www.reddit.com/r/dataisbeautiful/comments/i2vx78/the... for example. It shows more than 10x land usage for cattle and even more for water and energy, sources and their bias discussed in the comments over there. There is also some interesting links stating that purely grass fed beef can only provide half the cattle on same unit of land.
