No, no goalposts have been moved. It is worse for the environment, in all aspects, including biodiversity, to raise animals to eat than to eat the crops directly.

The reason is simple: to produce the same amount of energy (and protein) with livestock as you would with crops, you have to use orders of magnitude more resources and you affect the environment orders of magnitude more: you use more fuel, release more greenhouse gases, use more water, use more land area, destroy more soil, et.c.

And while it might be true that one hectare used for grazing might be more biodiverse than one hectare used for, your example, soybeans. But 85 percent of the world's soybean crop is processed into meal and vegetable oil, and virtually all of that meal is used in animal feed.

I think you need to look up the meaning of the expression "straw man". And about the rainforests: Tropical rainforests are the most biologically diverse terrestrial ecosystems in the world, and right now, huge areas of that rainforests are destroyed for the land to be used to raise cattle.