No, it's not.
There is no such thing as a "24 hour cancellation policy." If you can find any reference to "24 hours" in any of the policies, I'd love to see it.
The policy for cancellations is "one day prior." You can cancel up to midnight the day before without being charged.
Some ADR's require two days notice, but that should be clear when you book them. CRT, and maybe the dinner shows, are the only ones I can think of at the moment.