Checked the confirmation email and it does say:
Canceling your reservation after [date and time of the moment I booked it], or failing to arrive will result in forfeiture of your deposit.
So it does seem like it was non-refundable when I booked. I'm just so accustomed to points bookings being flexible rates that I never even thought to check.
There is a big event in town that week that will be
drawing in crowds numbering in the 5 figures, so very understandable.