There is a facebook group for Quebec immigration where 3 people got PPR sometime back. One among them got an email from IRCC saying that PPR was sent by mistake. Just when we thought everything will be settled soon ... we have stumbled upon a new block. It was sent in French and here is the English translation.
"Dear Sir / Madam, Please note that correspondence dated September 3, 2020 informing you that we are ready to issue your immigrant visa has been sent to you in error. Indeed, in these times of crisis, the order in council prohibits us from finalizing any economic file for the moment. We kindly ask you to ignore this letter. We sincerely apologize for this error. We will notify you when the situation changes and when we are ready to issue your visa allowing you to enter Canada."