I assume the Progenitors are probably very old and very far away with no way to update themselves on the current situation. The Ark(Arks?) are more of a fire and forget thing I'd think, while they concentrate on not dying so they don't get damned.
I do differ from a lot of you on the nature of the Inchoroi though I think. They're described as a "warrior-caste". This to me suggests that while they're artificial, they're derived from Progenitor stock. And to be fair, if the Progenitor have thrown themselves as headlong into transhumanism as has been suggested, aren't they all fairly artificial, by that metric? So rather than be purely analogous to Sranc, I'd say Inchoroi are more just designer-baby soldiers. Though given how much they alter themselves they may be quite different from the original product.
I also suspect the Progenitors themselves, while not as single mindedly obsessed with the carnal as the Inchoroi, are probably still pretty perverse by our standards. I mean, isn't that part of the point? The things people would do to satisfy their hungers if given these options?
I think the book makes it pretty clear that Aurax is the only Inchoroi left. At least on this world. Maybe there are other Arks flying around elsewhere.
I was going to post this. I wouldn't be at all surprised if the Progenitors sent many ships out into the void to find the Promised World that could end their damnation.