The unrated dlc restore the adult content removed from the English release to be the same as the japanese version of the game. Its my understanding that as the mosaics are required by law their in many/most cases there is no version without them to release as the original artist often does not fill in details knowing that they cant be shown in the release version in Japan.

As such for most International releases of japanese games and released without removing the anything found in the original release is normal described as uncensored, especially as steam and gog used to require the removal of any nudity or sexual content for release on their platforms.