Your other links say that meat production does produce more GHGs than vegetables, and are just saying it's not as much as some reports have said.

You still haven't got it about the American diet, have you? The suggestions for diet in general are not saying "use the American diet". They are saying we need one with less meat than that - and that would be both healthier, and better for the environment. The argument has always been about CO2 (and methane). It's just you who has been trying to divert attention from that.