I mean all older VNs had uncensored version in more adult friendly sites. It was the way it was when adults games came to Steam. We had to rely on patches on Steam all the time. I believe you that game and huniepop are censored in GOG, just like they are on Steam, but that's the way it was back then, and we always had to rely on patches, while adult friendly platforms didn't need patches.
Nowadays GOG is much more open to adult content though it depends on publishers and their relation with GOG whether the game will have the patch as dlc or uncensored in the base game.
The boss of Kagura Games told me some about that and the FAKKU issue. Hey add me to friends.