It does rather sound as if clarification is needed from somewhere.
If PPR by radio is OK (which I know it is with some airfields), then maybe their words should omit PPR - because those with radio will call up - and say "NoRdo PPO" so those without the benefit of wireless know to phone beforehand, so that the AG/FISO/ATC knows what to expect.
But unless I know otherwise, I will continue to phone those marked PPR before I leave the ground on the way there. That's the failsafe mode.