has anyone gotten solid confirmation on BXP1 Upgrade certs expiration date?

I called meeting services myself and the person told me if we are holding BXP1 you can still request the upgrade until that expires. She told me its awards like a flights using points they cant book after December 15th. They should be able to process upgrades until the published expiration date as per the agent i got. Do you think that's reliable or was she just guessing based on the wording. My experience with AA in the past, is that they have zero hesitation to tell you what they think and have no way to guarantee. I emailed the day it was announced and got zero response, i think no wants to do a written documented answer to anything on business extra ending LOL