I'm grateful for your reply.It's not a mistake.
The e-mail IRCC sent to you was a generic e-mail.
Also, officially bio from Super visa is not applicable for PR. But many people got exemptions and never asked for a bio. In your case, if the CO determined your parents are "deemed Canadian", s/he will not ask for the bio and you will get a refund.
"Deemed Canadian" ??? as in kinda looks like an open-and-shut-case??