Not a Leak, just a Theory: Rhaena is going to adopt the alias "Nettles" while hiding in The Vale, maybe even 'coming up' with her book backstory as a cover.
TFW you want to write a plot about 'political squabbling taking the focus away from a world-wide threat' but your focus is taken away from that because writing political squabbling is fun
Hot Take: HOI4's focus stopped being about a 'WW2 simulator' a long, long time ago. Hoi2 and hoi3 were about that, but hoi4 since Man The Guns (at earliest) is all about the 'alt-hist' DLC machine.
I'm not saying that every criticism is wrong, but I feel like Chapter 5's "point" as a light-hearted breather chapter would have been received much better if it was bundled with 3+4+5.
You know what I mean, it'd keep people's expectations lower instead of antecipating 'an event' at this point in the plot.