This isn't your typical candidate experience - applying for a vague job ad, being asked to answer 6 puzzle questions, invite to an open house, two days of free training and then left alone for three weeks, followed by a vote by the tribe to see who will get the job.
It's definitely a plus that many of the students were hired elsewhere, but this is likely a method that would only appeal to the unemployed. I hear quite a bit of negative feelings towards companies that ask for extensive amounts of time commitment during the hiring process, and this is probably the highest level I remember.
If most companies asked candidates to go through this process, I expect they would want (and feel entitled to) some explanation at the end of the process.