Not sure I'd class anyone who has watched most of those as a sci-fi nerd. As somebody points out in the comments on that site, most are just mainstream blockbusters. Many people will just watch those, regardless of whether it's sci-fi or not.
Given the type of site buzzfeed is though, I guess it's not wholly unexpected.
I imagine this type of question has appeared on proper film sites before with mostly lesser known sci-fi films, to sort out the real sci-fi nerds from the wannabes.
For what it's worth, I've watched 43 of them.
36/51.
Not sure why The Truman Show is bundled as “Sci-Fi”.
Maybe because of technology used to record Truman every where he went in his world, was not possible at the time the film was made. Cameras have certainly got smaller, but maybe in 1998 they would have been too big, or the equipment needed to transmit signals, etc.
The Prestige is another that I would not class as a sci-fi film. In my opinion, it's more drama and mystery. It's been a long time since I saw it, but someone mentioned that there is a teleporter, which would put the film in the sci-fi category, at least in part.