Unreliable narrator is something different. How do you know the narrator is unreliable in the first place? Because the story includes enough information to contradict them. The narrator is unreliable, but the author is not—you're relying on the author to subtly inform you that the narrator can't be trusted. That's a device which goes back much earlier, at least to the romantics. What we're talking about here is different. "Unreliable author" might be a good name for it though.