Charles & Camilla flew out to Rome on a planned visit so they missed one another by mere hours. Harry obviously didn’t want to spend any time with them. He will have known of their itinerary. There are so few occasions when he does fly over now from Montecito. An opportunity lost, especially with his father’s health I think.
Oh leave the poor bugger alone! It is all speculation - like local gossip on a grand scale. There is obviously a bit of a family rift - let us leave them to sort it out in peace.
Harry obviously didn’t want to spend any time with them. - it is obvious only to you. You, nor I nor anyone else have the faintest clue about it, so need to butt out.