I do wonder though, why it costs double that of both the original PinePhone and also almost double a Pinebook Pro when it is essentially recycling most of the components from both…

This isn’t just a RK3399, it’s more a RK3399S (as they call it themselves): a RK3399 modified together with RockChip specifically for the PPP. There is quite a bit of work in making that happen. Also there is more RAM, way more and faster storage, a better back and front camera and a better wifi chip supporting 5Ghz wifi (the original PinePhone only supports 2.4Ghz). I’d say the price jump is justified.