I'd go further than disagreeing with his scheme, there is a reasonable chance it is illegal to charge such an extortionate interest rate, and may constitute usury...
Its a neat idea but seems to struggle - misidentifying PHP as BASH, and struggling with Haskell, Go, Clojure, and told me Bash was PERL. I pulled some test code from the What's That Programming Language site which appeared on HN a few weeks ago http://wtpl.heroku.com/.