This DLC does not add any new content to the game.
This DLC does not increase the base game's rate all the way to the R18 level. (There are some player mods that do that.)
The censor bars you see in the trailer and screenshots above are in the game as well if the game is not modified by any mods.

This DLC's sole purpose is to unlock the entire "Gallery of Memories" of the base game. (All current content and all future content in this gallery.)

You can absolutely unlock everything without buying this DLC at all through normal gameplay.
You can even input some RGSS code to achieve that in the game's console command.

But, if you don't want to spend dozens of hours exploring the vast game world to unlock those 3D cutscenes, then, this DLC is for you.
It's overpriced. Because I'd much prefer you actually go to play the game.