If you are willing to defer dismissing this tool out of hand as a p-value generator, you can get a better feel for how the author (Evan Miller) thinks about stats from his web site [1] and a presentation he gave [2]. I think you'll find that "Wizard" is not the product of whimsy.

[1] http://www.evanmiller.org/ [2] https://www.youtube.com/watch?v=TzJMFxj7GRI