The thing of "is fictional" already sounds like something typical of the officialist world. But seeing so many real versions (unofficials) of this game, it lose a lot of the meaning that it's fictional.
It was clear that it was originally intended to be fictional, but it doesn't take away from the fact that there are real & playable adaptations of Fix-It Felix jr to pay tribute to the movie.
Its existence would have been much more accepted and verifiable if it has really been in 1982 by Tobikomi instead made by Disney in 2012.