junnakurokawa
Yes, it was ambiguous. That sentence in your example was part of rule #4. But before you get to rule #4, you have to read rule #1 first, which then stated:
"Readers can become loyal readers of our authors and receive advance chapters by purchasing Privileges"
"Receive advance chapters" insinuates that they would be getting the chapters as they are, without having to do any other efforts to read them.
Moreover, even before they could get to the Privilege Rules page, these people bought the Privilege from the Privilege page. That's where the amount of SS is shown per tier and they can actually click to buy. And what was shown there before? The header said "Read X advance chapters". Yeah, and do you think the word "READ" is not misleading?
Of course you may be right, in most cases these people probably didn't bother to go to read the Privilege Rules again (hey, it's an extra click, but that's another discussion), but the info on the Privilege page itself was already misleading enough to make people feel like they've been duped.
Again, stop the victim blaming.