This makes no sense, and is a typical non-sequitur thrown out by those who are unwilling to give up meat. There is absolutely no evidence that meat eating is the limiting factor in population growth.
I can eat meat as much as I want provided another 7 billion people don't also do the same.
The issue is with the number of people, not the activity. Literally any use of land is a bad idea at that scale, we end up in rabbit hutches.
It does to first order. Then we just end up with more mouths - like what happened after the Haber-Bosch process.
So you're saying eating meat is fine then?