I am not an AUL owner but I was watching availability to try to book last Christmas (2025) at 7 months, and it seemed like inventory, especially for high-point-cost rooms, stuck around until 8-9 months? That said, I wouldn't sleep on it, especially as an owner.
FWIW, as a VGF owner pre/post its expansion, I was always on at 8am sharp at 11 mo for Christmastime, and it was ... varied. Some people were walking for January (low points) and so I would check throughout the day for availability if I didn't get it right at 8am. But usually I could get what I wanted at 8am.
Another time (2018) I was booking BLT for Thanksgiving and got the last 2BR (dedicated) at 8am.
If you have absolutely inflexible dates, I would walk to be sure. But if you're flexible as to room category and dates, based on what I saw for Christmas 2025, you should be ok if you book right at 11 mo.