I actually think the whole situation is a combination of different things and Harry has either misunderstood, mixed up different elements or messed up the explanation when talking to others (like his ghost writer) or he really just doesn't have the ability to see the nuance in real world situations.
Like all major organisations, commercial companies, big non-profits and government departments the teams working for the Crown use a variety of different techniques and tactics in their communication and PR work. The royal family does have one unique element in the royal rota but that's less evil cabal as some people seem to think and just a way to manage logistics and numbers when there's a lot of interest in particular stories.
There are 'briefings' - this is a common practice of getting a large amount of information out to a big group of press organisations at one time. Everyone sends a representative to a group setting and a rep from the palace briefs them on something coming up or several things. Again this is for logistics and planning. It's for 'This is happening in Spring' 'Plans for the royal wedding' type of news, not 'here are some nasty stories about Harry'
There are relationship-building exercises - also very common across the commercial and non-profit world. At certain times of year journalists are invited to social occasions - everyone involved in these things knows that side A is hoping for more favourable coverage and side B is hoping for more favourable access and exclusives. It's a delicate dance where no one promises anything but everyone hopes they will get the better side of the deal. As a journalist if you are a generalist on a big patch with lots of big companies, charities etc that you regularly report on you eat out A LOT around Christmas time.
The job of the PR teams is to maximise good news and minimise bad news so if you can persuade someone to publish a flattering story it's a win. The job of the news publisher is different depending on the publisher - for some it's about getting the 'truth' out there, getting exclusive stories for the good of the people. For others, it's about making as much advertising and sales money as you possibly can. So if they get offered a juicy distraction they'll take it - this is a tactic massively used by celebrity PR agents who often offer a better story from one client to save the bacon of a different client.
I'm sure some of the teams within the different BRF offices are particularly loyal and or competitive about their principals, it's probably a point of pride/career boosting to be able to get the right kind of publicity etc. I think it's unlikely that this work they do is micromanaged by each individual royal principal.
Harry seems to have a problem with things that have actually happened getting out there in the press and assumes it has to have come from someone close to him or by phone hacking - he's totally ignoring the more likely possibilty of all the non key staff, vendors, members of the public, friends of friends etc who gossip and tell each other the latest stories they've heard which eventually get to the ears of someone who knows a journalist.