Have you never built something for fun in your spare time? The author just likes mario, they're not trying to sell you a product. You're reading far too much in

Have you never built something for fun in your spare time? The author just likes mario, they're not trying to sell you a product. You're reading far too much in to this. The interesting creative output here was making a platformer work in vim, if they wanted to design their own original game as well they probably would have used a more traditional development platform.