I might be able get behind this argument when you talk about the rules on plastic straws. But red meat is terrible for the environment. As is driving cars. Especially ICE and especially when it's just one person, i.e. most work commutes. Another thing is heating/ cooling homes btw.
I personally think there are a lot of small things we should do as individuals but I understand not everyone might want to do them. I also agree that it's up to governments to do a lot of heavy lifting. That can be things like establishing district heating or improving public transport. But maybe it can also be adding higher taxes on red meat.
The ballpark numbers seem well in line with similar studies I have seen elsewhere. So while I don't doubt there might be minor flaws in this particular source material, the point still stands.
We shouldn't nitpick too much about stuff that's generally trying very hard to get facts right while the right or making up shit left, right and center and call fact-checking a limitation of their free speech.
Suggestion: point out flaws but also confirm that it's definitely not just made up and probably largely correct