I think the guest may be referring to the aspirated pronunciation of an initial
p as opposed to that found in the middle of a word, which is not aspirated.
I was taught a little trick to learn the correct pronunciation of an aspirated /p/: take the word 'pottery', for example. Hold a piece of paper in front of your mouth while pronouncing this word. The paper must move slightly as you pronounce this /p/, so this means that a little air escapes from your mouth. You can also use a lighter
Of course I'm talking about RP (Received Pronunciation), that is, Standard British English, and you could argue that this is not a variety that you find nowadays, at least not so easily. I'd agree with that.