I am not the poster you are replying to but calling that post “bad faith participation” surprised me. Stopping ethanol production will lower demand for corn so it is conceivable that this would reduce the marginal value in producing corn and cause some amount of corn production to become worth less than the alternatives (like planting different crops or less intense farming of corn field, etc.)

To me at least, not being an agricultural economist, the statement that the corn would be grown anyway wasn’t obvious on the surface; I too would have liked to have seen some further justification for the claim.