Question regarding Maitetsu's R18 dlc

since I just bought the VN on Steam, I was wondering, If I buy the DLC through Fakku, will I get a Steam key for unlisted steam store content?

It would be very annoying to constantly come back to fakku for the patch everyone I redownload the game. If I do so, I want the whole game to be downloaded at once.

The good thing about steam is that you can still redeem keys for unlisted content, like what some do for removed games like Transformers Devistation.

TL;DR: is the fakku patch a "mod" or a dlc key? I'd prefer a key