Huh? That makes no sense. If you have a confirmed ticket on a specific date you can’t cancel 1 to 7 days after that date. You either flew confirmed or you didn’t show up. If you want to change from confirmed to NR you must cancel the confirmed ticket more than 7 days prior to the date of travel. Nothing matters once the scheduled day of travel passes.

Maybe you are thinking there is a 14 day window on when you can nonrev? But that isn’t true either. You are only blocked from NR on the same date of travel and the same city pair. You can travel on the same city pair the day before or after, or on any other city pair on the same day as the original confirmed travel day.