On the phone with support rep and this is 100% true. If your extension was granted after 10/25 - your residual will not change anymore due to extra payments. If the extension was granted before 10/25 your payments will apply against the balance and it will be manually calculated by the rep when you or the dealer calls in for detailed balance.
If you re-extend past 10/25, new policy applies retroactively to payments.
She is sending me a payoff statement with added payments and MSDs backed out. Buying the car out tomorrow.