I don't find it convincing. Even though it's long, I don't recognize any of the examples as being 'Ra' ness and I can't think of any examples of 'Ra' in my own experience, the concept draws a complete blank. The name 'Ra' is also not that great as unlike some of the other reifications going around like Yvain's 'Moloch', which at least have some intuitive connection with their concept, 'Ra' seems pretty much arbitrary. In contrast, the first time I read about the prisoner's dilemma/tragedy of the commons, it hit me like an epiphany and I went 'of course! this explains everything, from people littering and cutting across the grass to war!' (And since Moloch is just coordination problems in general, it made equal sense to me.)
EDIT: Obormot and saturn2 on IRC note that 'Ra' seems in her telling to slightly overlap with the whole complacent-elite meritocracy going on in the Ivy League & Wall Street, of the Twilight of the Elites type.
Have you read James C. Scott's The Art of Not Being Governed? I recommend it in general, but I think his description of southeast Asian empires has them displaying a lot of Ra-ness. People in empires are self-described as being better even when their lives as similar to-- but worse-- than the lives of people outside the empire.
https://srconstantin.wordpress.com/2016/10/20/ra/
A detailed look at the belief that high status social structures can be so much better than anything one can think of that there's no point in even trying to think about the details of what to do, and how debilitating this is.
Discussion of the essay