Yes, and the corn-based ethanol here is used for "feeding cars" that have combustion engines, i.e. it's already used exactly for energy production. The most recent Technology Connections video[1] quoted some numbers on this. All this land dedicated to disposable energy production could be dedicated to renewable energy production instead.
Your main point still stands, but aren't both of them renewable? Corn is a renewable resource, thus ethanol derived from it is too. It's just seemingly a much less efficient renewable fuel for powering a car compared to solar.
upwards of 60% of the ethanol used in combustion engines is completely wasted.
Such an unfathomable waste when you put it in the context of “feeding cars”. I really appreciated the way this channel broke down this viewpoint. Made me want to finally get some panels for my balcony.