The source says the page was created on Jan 14th, 1998 and it was created automatically from hundreds of sources on the web.
OK, mystery solved. I didn't think he could have possibly read quite that many books by his early twenties, especially given that he was doing a bunch of other stuff at the time.
However, yeah, having Mein Kampf on a list entitled "My Favorite Books" is a bit embarrassing.
A bunch of 'em seem to be listed twice, in immediate sucession, though, which is weird.