Earlier quoted context omitted.
It sounds like you didn't read the report or check the references on page 26. I recommend reading this paper and coming to your own conclusion about "almost no doubt". Within sustainability science, there is little debate about the lack of efficiency to produce protein via cows. https://journals.plos.org/plosone/article?id=10.1371/journal...
That's more impressive, and yet, as a non-expert, I still don't know how to evaluate whether the calculation is bug-free. Do you? I guess I'd have to track down all the references and build my own spreadsheet? There are some spreadsheets listed in the references, but it seems like a complicated task. Just to nit-pick one little detail, it seems to treat all land the same: "Significant decreases in land occupation als…
There doesn't seem to be ground to overwhelmingly doubt to evidence to the point where the conclusions are radically reversed.
It's a known cognitive bias (assuming you don't know what you're doing) or sophism (if you do).
See: https://www.lesswrong.com/posts/GrDqnMjhqoxiqpQPw/the-proper...