This is also not true. Read this:
How long are biometrics valid?
If you are applying for a
visitor visa or work / study permit, you only need to give your biometrics once every 10 years. However, if you have an application refused and you later reapply, you will need to renew your biometrics.
If you are applying for permanent residence, IRCC says you will need to give your biometrics and pay the fee regardless of whether you provided your biometrics in the past to support a visitor visa,
study or work permit application or a different application for permanent residence.
I got that information from this website (
https://www.cicnews.com/2018/07/canadas-new-biometrics-rules-start-july-31-heres-what-you-need-to-know-0710947.html#gs.55acn0) and it's also available on the CIC website. Please pay for biometrics when applying for PR. You are not exempt.