Hard to reason with a leftie conspiracy theorist, but here goes. One reason that US based report might have come to a different conclusion is their electricity mix is very different, relying on coal for just 40-45% of their energy production, we rely on it for 75%.

But I think it is in the minority coming to that conclusion. "The conclusion: Even in the few states with the very dirtiest grids, driving a mile on grid electricity is barely worse than the most fuel-efficient non-hybrid car (roughly 34 mpg"
It's only looking at operating emissions, not lifecycle. And only carbon at that! Both biases skew it heavily in favour of the EV.

But credit to them for ending with this; "We should note, however, that for certain non-carbon smokestack emissions--including nitrogen oxides (NOx) and sulfur dioxide (SO2)--that mile driven in an coal-powered electric car is worse than one in a modern gasoline car."
And remember - that's in the US where they rely less on coal than we do in Aus.