So... is this game rather lore accurate, or is it all just a hornified alternate universe?
I don't see lore/canon-focused 40K ero-game getting made without the creator getting burnout and abandoning the project before long.
I'm not really convinced there's creative space within a 40K setting for a lore accurate ero-game that'd satisfy both 40K fans who value canon and more typical players of ero-games. It's not that I think it can't be made, it's that on making it the additional effort will not be rewarding
for the creator.
For reasons of practicality the foundations of 40K setting are built on choices to appear familiar (and acceptable) to both western sci-fi fans and fantasy wargamers. The setting was always developed with the product in mind.
Not many long time sci-fi fans are going to say "that's stupid" when they learn about how the navigators move ship through the warp, because so many of them have read Frank Herbert's Dune. They might judge it as a rip-off, they might decide it's a different spin on the concept; but the difference is by re-using something already accepted by sci-fi fans the new product is received with some amount or pre-existing good will.
For an ero-game, there's a different set of practical choices to make if it's going to be acceptable to players who've previously played ero-games. Some examples: if every other game had some amount of porn sandbox scene within minutes of start of play, or a minimum amount of meaningful variety or love interest, those expectations will appear in feedback if a game doesn't offer those.
So an ero-game for 40K either does a bunch of stuff to establish 40K credentials and meaningful representation of the setting (and delay the earliest possible porn sandbox interactivity), and adhere strictly to the pervasive Imperial human culture of distrust and contempt for Xenos (aliens) or casually depict the fuckable Eldar in the promotional screenshots.
It's not that it can't be done. It's that it's really, really unrewarding to pursue because there's always some internet upvote addict wanting to flex their credentials and call out any compromise (without a moment's thought to whether it was well chosen). Overlap between the two practicalities I've mentioned just seems like a straitjacket for how much creative choice. And anyone working on a project that's unrewarding is more likely to burnout.
So, like I already said in the first sentence. Yeah.