This author says, "they emit almost completely clean CO2 (note that bar global warming, CO2 isn’t considered harmful)" ... To my ears, that's a major understatement ("bar global warming"). I'm almost inclined to think it's more partisan than the original post, to be so dismissive of climate change.
But beyond that, the point that seems most incongruous is the suggestion that because volcanos emit a more explicitly toxic gas (S02) that we shouldn't have an awareness of our own emissions and their effect on the environment. By comparing it to a volcano's emissions, I am simply impressed by the scale.
I think you really have to read into this to derive a moral/political statement. Nobody is trying to hide the effects of S02.