That graph is horrible and provides very little data. The graph shows the output volume of a single coal plant and then compares it against a just a volume. Without knowing how many plants would be required to consume that much volume, you have two different units of measure along displayed. Volume per plant VS Volume.
A better comparison is given in the article, which says LNG is half the CO2 output per unit of energy produced. This doesn’t capture the whole picture though and the article dives into those details related to leakage of gas, and costs to produce. The article doesn’t bother to give a comparison to the emission equivalent of the energy spent to mine the coal either.
I don’t think the article is making the assertion that its author is attempting to make.
Shit, I still see them pull out checkbooks.