I don't know if I could prove this, but I would bet there are more vegans now than any time in history, and I know there is more meat produced than any time in history. being vegan doesn't stop the growth of the meat industry.
This is true on small scale subsistence farms, but it breaks down when scaled up to the amount of meat consumption in typical developed nations
I'm afraid you're misinformed.
soy cake is a byproduct of soybean oil production. it's about 90% of the soy we feed to animals globally. that's one of the biggest ones, but you'll find this repeated across the industry: corn cobs and corn stalks used in fodder, crop seconds like onions and tomatoes fed to livestock etc.
it's absolutely falsifiable: show how the problems of analyzing diverse LCA models have been rectified. they don't do this, though, they just charge ahead compiling the data.
make any excuse you want
all the evidence is to the contrary