If you did not renew your licence plate sticker(s) during the temporary extension period put in place due to COVID-19 and you choose to renew at this time, you will be required to pay the renewal fee for that period and your next renewal period.

https://www.ontario.ca/page/extended-validation-periods

Правда не знаю может продажа машины это исключительный случай и ты таки должен будешь таки заплатить