I see. Thank you!FODS has never been mandatory.
The short program requires a specific death spiral each year. This year it is backward inside.
In the years where backward outside was the required element, I think recently forward outside has also been listed as an alternative.
The free skate requires one death spiral, which must be different from the death spiral in the short program. So any of FiDS, BoDS, or FoDS would be an option.