If the Romulan government was so willing to abandon the population of Romulus and just evacuate the high-ranked people, I doubt they bothered to save the Remans at all. Well, maybe a small number of them to continue using as servitors and cannon fodder.
Honestly, I didn't understand the logic of why they were slow to evacuate their homeworld because they were using the wrong figures. I mean, if it's their own star that's blowing up, then that means Romulus is toast no matter the precise figures of the supernova's wider reach. So there should've been no ambiguity about the need to evacuate the homeworld first, especially since it would be affected years before any other system (unless we assume FTL supernova effects as in Generations). But then, we're talking about a government used to rigid control over the homeworld and in deep denial, making irrational decisions, so I can kind of buy that it's not supposed to make any sense.
Still, even something as seemingly insane as climate denial here on Earth has a comprehensible motive behind it -- namely, Russia will benefit from global warming while other countries will be hurt, so Vladimir Putin is backing climate denialists around the world in order to sabotage the fight against global warming. But what reason would any Romulan faction have to condemn most of the population of Romulus? Cui bono?