Sounds like with this change, cobrand plats are officially not eligible:
Thank you for considering the Personal Card Annual Credit, formerly referred to as the Corporate Advantage Program - unfortunately, we've found that Schwab Platinum Card Members are not eligible for this offer at this time. We're sorry for any inconvenience or confusion this may cause.
Here's what we're doing
As a courtesy, we won't make any changes to credits you may have already received. However, we won't be able to issue you any future credits.