I stopped keeping up with this game a while ago, but didn't the devs say they would've released the mature content themselves?
Also there is a version of your mod on the Steam workshop but I'm not sure if it's legit or up to date.
Viewing post in Idol Manager Uncensor Patch (v1.0) comments
They planned to add it to the game themselves initially, but due to strict age ratings and a possible ban from selling the game in specific territories due to that NSFW content, they had to tone it down for the full release.
As for the version available on Steam: I wasn't the one who made it or uploaded it, and haven't tried it either. Use it at your own discretion.