Posting the question on PerlMonks doesn't seem like a particularly subtle way to cheat yourself into a job, especially when you have already mentioned in another context where monks hang out that the challenge was taken from a job listing.

I have no more evidence to go by than you, but I find it hard to believe that BUU would be so delusional as to think this would go unnoticed.

I do agree, of course, that his failure to mention his source is inexcusable.