The publication says (page 2): “All other contributions have also undergone peer review
from experienced reviewers.” So this is peer-reviewed, just not double-blind.

The “Journal of Ecological Society” is not a real journal. It is not in the Master Journal List. It has no impact factor. It is just the publication of a group called “Ecological Society”.

If you try to cite this study when talking to anyone who knows the first thing about the peer-reviewed journal system, you will get laughed at and your arguments will be ignored. As I say, I am sure it has useful ideas in it, but until it makes into a real journal, it is NOT peer-reviewed science.

A much better paper to read and cite on food system emissions is this one from Science which shows that dramatically reducing animal ag is required to avoid catastrophic climate change.
https://sci-hub.do/downloads/2020-11-05/54/10.1126@science.aba7357.pdf

The framing is very simple. Food system emissions will cause catastrophic climate change in a few decades even if we reduced all other emissions to zero tomorrow. But if we cut out most animal ag and make some other improvements, we can have a slightly carbon negative food system.

Great idea!