OP, I can see that you're confused. Who wouldn't be with such a poorly worded OfR.
PCN in this context refers to one served by post - in parking jargon a 'regulation 10' PCN - and not one served by hand/affixed to a car, which applies to you.
Your grounds are that, in the words of your OfR, you did not receive the Notice to Owner/PCN.
The wording should be 'did not receive the enforcement notice', but what the hell, the council might get round to changing their wording one day, or not!