The fun thing with "the creator lied to us" is that it implies different things depending on who we assume wrote it. Like, let's say it was Alice. What if she was only "loved by all" on the fictional side of the screen? She could've been one of those characters that was popular in-universe, maybe a bit over-hyped, and boring or annoying to the audience. Realizing her fame was fake would be quite a betrayal.
We sort of have different characters saying it too, seeing as Barley’s belt says “LIAR” on it. Though it’s worth noting the official Instagram posted a photo of the message with “Lied about what, exactly?“ (or something to that effect), which implies that the lie was somewhat universal.