Privacy

Any time a cop has the legal authority to access the contents of your phone, you can be compelled to provide your fingerprint or face to unlock it if that will work. If your phone doesn't have those features enabled and relies on a PIN, they can't force you to tell them that outside of some unusual circumstances like parole obligations because you agree to those. They can still access your phone, but only to the extent that they can without the PIN. In this case, cops had the required authority because of his parole obligations, but they'd be equally able to force you to unlock by fingerprint or face if they got your phone as part of a search warrant and I think if you're arrested but only if your phone is relevant evidence. Maybe even if it's not, but I'm less sure about that.