It doesn't seem to be 330 days out every day. On Friday, I could see partner award flights up through Thu 25 Nov but nothing for Fri 26 Nov onwards. On Saturday, the same thing. On Sunday, the same thing. Do they only update once a week, do they only update on workdays, or what is the schedule?
The partner airlines shown there (including AA) are several days beyond that in their 330 day out published schedules, and I can see the partner availability to other airlines on AwardNexus several days beyond that too. So it seems to be Alaska's own calendar limitation.