Had a proper dent (with a crease at its centre) in the lower door which the dent guy tapped out to his (and my) satisfaction. The PPF was marked on the surface by the work (if you looked closely) but the self healing properties took care of that over a week or so. Basically undetectable now, unless you lay on the ground and know where to look, even then I'm not sure you'd know what it was you were looking at.
In a sentence, PPF doesn't prevent dent removal.