There is no doubt about it that in the past during the 'War of the Wales' there was planting and leaking, they were called out for it. Is it still going on , who knows?
The palace does need the media to deliver what the royals are doing, their various projects etc etc so that is not surprising, Are they leaking on other members, we do not know.
Harry needs to be careful, there are those that believe he is doing exactly that along with Megan through their chosen ' up and coming' journalists.
Planting and leaking is not what the court case is about, it is about illegal methods of story gathering, which in some cases is not denied.
This all happened many years ago, things have changed hopefully for the better, journalists today have said that some of the stuff Harry put in his book they would have been banned from publishing in a newspaper by the lawyers.
He also needs to be wary of what he has said in interviews and written about, he gets his facts mixed up, so how reliable a witness is he. I personally do not think he cares about winning or money, he wants to name names in court whether the judge strikes it from the court record or not, he wants to say what he wants to say then it is out there, how accurate it might be is anybody's guess but mud sticks. Just my opinion, but he appears to be furious that William settled out of court, he keeps inferring it was a secret deal, is an out of court settlement not usually kept private, has he moaned that Hugh Grant and Baroness Lawrence settled out of court.
IMO he is unhappy with the Late Queens Private Secretaries, he made it clear in the book he did not like them. He might not like it if they give their version of events.
We will know come January,