Annual plan paid monthly - price increase and renewal date

I have a plan of this type (20GB Photography Plan) which started (with a 7-day free trial) on 15th February 2019, the first payment being taken on 22nd February 2019. Therefore, the last payment of each year's subscription should surely be the one taken in January. At times I have bought annual pre-paid subscriptions from Amazon and added them to my account, and each time this has shifted the "next payment" date forward by 1 year as expected, so I assume that the (effective) end date of my monthly-paid annual subscription should also have been shifted forward in the same way - for example, if I bought such an annual subscription in, say, November 2023, then the monthly payments for my original subscription that started in February 2023 ought to be February - November 2023, then December 2024 - January 2025, since that is 12 payments. At present, my next monthly payment will be in December 2025, and my account page indicates that this will be at the recently-announced increased price. However, I read in https://blog.adobe.com/en/publish/2024/12/15/all-new-photography-innovations-pricing-updates#photography-and-lightroom-plan-updates that "Monthly billing remains an option for existing members with an updated price of $14.99/month, with an annual commitment, effective at your next renewal". Therefore, shouldn't my December 2025 and January 2026 payments still be at the existing subscription rate?