I actually have a feeling that this is real and they're just trolling us.
Lemony Snicket doesn't want anyone to read his books and this is just part of the facade. Honestly, there's no way that a fan could do this. This level of quality and attention to detail needs a production crew. I think it's just a guerilla marketing style to gain some buzz.
The poster is fake though, I've seen it around before. But the video is definitely related to netflix.