False, check the FAQ again.
As in this:
If you redeem your product registration code during the grace period, and add a valid payment method to your account, you will begin your billing cycle from then
, and you will be entitled to 30 days of game time. If you redeem your product registration code before December 20th, your billing cycle will begin on December 20th
at 12:01AM EST (the official launch date and time of the game).