Does the issue you reported against printer-driver-cups-pdf still
apply to the 3.0.1-9 version currently shipping with Debian 11
(Bullseye)?
Sorry I no longer use Debian, and I don't have access to a Debian machine.
But, if this printer driver is still used today, you don't want to close this bug without testing, because including the user name in the PDF file without the user's knowledge isn't acceptable. As far as I remember, I was worried about this problem when I needed to submit an anonymized document. Such needs still exist today.
To test this, you just open some document on a webbrowser and print it into a PDF file and
$ strings generatedfile.pdf | grep -i <sensitiveinformation>
Also, I think there are tools to print PDF metadata.
When I did this on my current computer (macOS), the PDF file indeed didn't include any user information as far as I can tell.
Regards,
Ryo