First thing I do after reading this story: search online to make sure this is not itself a hoax. Seems legitimate though, or somebody has planned the hoax since 2009.
https://en.wikipedia.org/w/index.php?title=I,_Libertine&oldi...
https://en.wikipedia.org/w/index.php?title=I,_Libertine&oldi...
definitely no hoax.
Pretty sure there's a hoax where people said an author? wasn't real.
So the hoax was a persons existence was a hoax. But cannot cite. 'Hoax' brings up as much spam as 'free software' on Google.
Perhaps the hoax was the person was made up for other reasons than a hoax, perhaps a lie or a joke. So it might not be meta.