I secure messaged Citi and the account specialist said:

If it is greater than 60 days since the Annual Fee was billed, then you will not receive a refund.
If it is equal to or fewer than 60 days, then you will receive a full refund of the $450.00 membership fee.

I thought the deadline for AF refund was 37 days after AF billed date. And anything beyond that was a prorated AF refund?

I was hoping to use my flight credit benefit again, but that appears unworkable since my statement closes Jan 3. On Jan 4, I will be exactly 60 days from when my AF was billed.

Any suggestions?