True, but the Romulans on Picard never displayed the kinds of excesses described in those notes, at least not on-screen.
On the other hand, these notes do shed some more light on why Narek felt so beholden to Narissa. And they're consistent with the in-character excuses he gave to Soji to keep her at an emotional distance before he broke cover.
I think something to bear in mind is that any attempt to convey an entire culture's foundation in a short set of notes is necessarily going to give the impression that the traits it concentrates on dominate a culture more than they actually do. If someone tried to describe American or British culture in a similar format, the attempt to describe what was distinctive about those cultures would probably give an exaggerated picture of those cultures just because any such attempt at short description is going to lack larger contexts and is going to focus on what is distinctive rather than what is not distinctive.
If I were Alex Kurtzman, I wouldn't reject Chabon's notes here, but if I drew upon them I would probably structure the episode to reveal that these concepts exist within a broader cultural context that complicates things. And I suspect Chabon probably would, too.