The thing is here, articles and people on reddit and twitter seems to state that the game was available to view by anyone on Steam but thats not the case at all by the looks of it.
Even now, try to open the store page without an account and you will be asked to log in. Even with an account you will need to set your account settings to enable adult content aswell as its blocked by default and always was.
And if the dev changed it, wouldn't this also be reflected in the SteamDB? and yes i pushed my Steam tokens for this game to make sure its updated...
So much of this shit is fake news without rime or reason. and i can easily point to close to a hundred titles just as bad as this one on Steam. many on GOG aswell as they opened their doors.
The game got an age gate with an nsfw account flag and full warnings on the store page. For me, the dev is all in the green no matter the content really.