What rubbish. The vast majority of soy feeds animal agriculture. https://www.wwf.org.uk/updates/soy-story

industrial waste from pressing soybeans for oil

That's not waste, humans can and do eat it, ie. TVP and we'd probably eat a lot more of it if we cut down on meat consumption as it's a great source of protein. This is like saying chicken feet are industrial waste because people don't consume them proportionally to breast, thigh, leg etc. meat.

Even if cattle don't consume much soy as a percentage they are still less efficient then if we just eat what they eat because of trophic loss. If we want to save more plants and preserve more ecosystems for wild plants we need to reduce the land footprint of our diets, and the best way to do that is to eat less meat.