From redactle-unlimited.com's About modal:

    About

    Redactle Unlimited was inspired by the original game at redactle.com which was inspired by Wordle. A random Wikipedia article is displayed with important words redacted (hence the original name Redactle). Redactle Unlimited has many useful features: multiplayer, smart guessing to match plurals and inflections (lemmatization), annotations and of course no daily game limit.

So, GP's game is a more feature-rich version of the original sitting at redactle.com if I understood correctly.

Nobody has heard from the redactle.com dev for around a year now. The main difference with redactle unlimited is that the 1 game per day limit is removed and the multiplayer feature is a lot of fun if you're stuck. Just make sure you go to redactle-unlimited.com and NOT the one without the dash!