The whole reason this has now become a big part of the discussion is because within a few hours of it being published, Harry and Meghan have made a public statement and brought in the lawyers.
I think IF there is any conspiracy at all, it would possibly be something that Harry and Meghan are involved in manipulating, rather than the RF or the newspaper editors.
Of all the things said about them recently, that Harry was nasty and rude to the Queen, that the Queen didn't like Meghan, the Queen believed Meghan orchestrated the relationship with Harry, etc etc., the PA allegations are the ones they have stepped in to defend.
Now its going to be a waiting game to see if the author retracts his claims, and if he doesn't,, will H&M pursue a legal case, and if they don't pursue it, why not !.