It was this part, which I'm guessing is automatically generated by itch.io. I did see the mention for the patreon builds though. I was just thrown when I saw the price tag.
Oh, yes, we unfortunately can't do anything to remove that. We had to set a price, or else the files would be free for anyone to download. As far as we're aware, there's no way to set the files so that only Patrons can ever download them, so unless itch.io gets an update, there's nothing we can do about that.