From what it seems, they tried to release Taimanin Asagi in full on Steam which likely had something not allowed. The Oneone1 games that are sold on Steam remove everything Valve might object to. (which is usually just all the h-scenes to be safe) And Kagura Games isn't telling you to visit their website and download an uncensor patch, but you might run into a user on their Steam Community page or Discord telling you about it.
AFAIK, ProjectH is trying to get the full thing on Steam, making smaller adjustments if needed. But Valve doesn't have well defined guidelines for stuff like this so it's a lot of back and forth with no clear answers. Though I can't imagine there'd be an employee that can answer at what point does sex with this horse-like monster stop becoming bestiality or when this girl stops "looking underaged". I don't think either side knows whether it can be released at this point.
From what it seems, full Steam release is current plan. If something isn't allowed, they might add an external source to add that content in. Else, move over to DLsite.
