IMO there is nothing that could bruise Piers ego, he is highly experienced, and longer in the game, than all combined shills that the Harkles are currently paying.
He feels slighted professionally, and that is something that in his world never happens.
Markle the papwalker in Wellington boots around the Mail Offices, the Z lister that sent him texts(documented) the z lister which informed him that she is on her way to a date in 5 Hertford Street with Harry, suddenly cut him off, probably because she felt that she made it.
Not even Diana dared to do that, in their world of compo(compensation) one cuts ties only in most extreme cases, because one knows that when ish hits the fan, one calls a journo for some image polishing.
The man got Diana's yachting photos from the paps, the same Diana that was so relentlessly pursued by paparazzi, that she constantly called the. Books mostly due to copyright hold Diana's images which are showing her moving completely undected.