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i don't find this paper compelling evidence that being vegan has significant impact. it relies heavily on ivanova(2020), and additionally cites poore-nemecek(2018). ivanova, themselves, rely heavily on poore-nemecek for the data about food impacts.
so the question is: do you trust poore-nemecek 2018? i don't. meta-analysis of LCA studies is bad science, and poore-nemecek not only designed a poor study, they didn't bother acknowledging the problems their methods could incur.
Why don't you bring a source to contradict?
This is absolutely not the only paper to support my claim
the rational thing to do, if there is insufficient evidence for a claim, is just to suspend judgement. it's possible their conclusion is correct, but the evidence used to support it is insufficient.
dismissing your source doesn't require a contradictory study.