What they’re saying is this is only tangentially agriculture. We grow crops, process them, and make additives for fuel or just fuel. If we stopped doing all that, we could provide enough electricity to make all the cars electric.

This, of course, doesn’t take into consideration things such as battery requirements, etc. but it does give perspective on just how much land is being used for some small fraction of car fuel, and how absurd biofuel is, given how little we actually use relative to our overall fuel use.

Edit: everything else you said is true, but even turning biofuel land into grazing land and having it covered by solar panels would be more useful. And we need more batteries.