I don't really get the reasoning in the speculation that H&M want to downplay criticism of the family following the Queen's passing. Wouldn't that be one less reason to hold back? That they don't have to worry about it being upsetting for her?
I have a couple of theories on why they might be having a change of heart.
As long as Grannie was alive, Harry was protected to some extent, because she DID dearly love him and his family. Whatever strife they caused by their external projects, she wasn't willing to cut him off completely - hence, we got BP's infamous "recollections may vary" response to the Oprah interview. Harry and Meghan could get away with their vague, inflammatory accusations, accompanied with misleading shrugs, glances and other body language that very clearly implied "it's all Charles, or Kate, or maybe Camilla, possibly William..."
Now that Grannie has passed, they don't have that insulation she provided as the head of the family. If they proceed down this path, there is zero chance they will be invited to anything ever again, including the coronation, and it's quite possible that Charles will do something like issue an LP taking away their children's titles.
Theory 1) Even if the relationships haven't been fully repaired or mended, they are smart enough to recognize that losing all access will devalue their brand and selling power. So, they need to pull back on everything that's been filmed and written and, somehow, pivot just enough to maintain access.
Or, Theory 2) Even if the relationships haven't been fully repaired or mended, they do feel differently about his family based on interactions and conversations that occurred during the time of mourning, and they truly want to have a healthy, loving relationship with Charles, William and the rest of Harry's family, so they're backtracking on everything that's been filmed or written but not yet published.