Sorry but, you're grossly misinformed sir and I would request you do more research or ask questions before spreading misinformation.
The copy FA on this page is the uncensored version. We haven't had a censored version of FA in years. There is a toggle in the options menu to turn on and off censor. The page you are linking is out of date and was designed to build funding via donations during demo phase of development (4 years ago). As a thank you to those that donated $5 on the old page before release we offered a copy of the finished product of FA on this page. Which was a pretty sweet deal (=
I have no idea where you got the impression of getting a steam key for purchasing on itchio. I am a new developer but that seems wierd to me. If you wish to play on Steam why not just buy FA there?
DLC4 is Patreon exclusive to thank our AWESOME patron's that have paid for the three DLC updates you can enjoy for Free.
-din