I don't know. This is a guess. but surely the above is boIIocks, for the following reason.?
If you only did short journeys on a hybrid, then the batteries would just go flat. At some point the IC engine has to cut-in to recharge the batteries, even if it is not actually used to propel the car. Unless you have to re-charge hybrids from the mains, which rather defeats the object.
But in general the hybrid is the much better option. But a really expensive one, nonetheless.
Good news for us petrol-heads yesterday, when the price of Brent Crude fell very low. I thought we were running out of oil ? I think it's a bluff.