Commercially available solar panels are below 30% in efficiency. If the energy going into the EV battery instead came from a gas turbine, the efficiency drop would be similar, I expect.

If you want to say that this factor doesn't count: In what sense should the oft-quoted factor in the final step count? (That is, the loss in converting from petrol to rotational motion in an ICE, or from electric potential to rotational motion in an EV.) I think the only real utility that number has is in estimating the total amount of stored energy in a typical car of each type -- this could be used to estimate the amount of damage that would be caused by the vehicle catching on fire.

Other claims strike me as meaningless.