Camilla is the wicked step mother who briefed against him to make herself look good
This makes no sense whatsoever.
Yes I agree that Charles and Camilla needs to do a LOT of PR to change perceptions so they could have a life together. And that the tabloid reading public were much harder on the woman (they always are) particularly as they pitted her against the prettier, and later deceased tragically young, Diana (just as they often pit women against each other).
But it makes no sense whatsoever for either Charles or Camilla to brief against Charles' DC. They needed everyone to look nice and happy - and bad stories about the DC ran counter to that aim. By the time Meghan was on the scene, they had been married for over a decade, and her position was pretty much assured by then. And I can't think of any particularly bad press about Harry at that time.
It's clear now that nearly all his wilder behaviour was not reported on, and only a couple of pix (Vegas and nazi uniform) ever surfaced, and the former of those was taken in a 'lads will be lads' sort of way anyhow.
So I really don't know what he's on about.