I thought the red e-fare rules said "Cancellation (on or before day of travel), "loss of fare". Changes are, however, OK and subject to a $33 fee and used as credit for a higher value fare...
This "loss of fare for cancellation" rule stops you cancelling the red e-deal fare on check-in. Not a surprising restriction given the price of the ticket. It was worse some months ago, you couldn't make ANY chanes AT ALL to the red e-deals once ticketed.