......but it does, just a bad one, is it a system bug that posts a comment like that?
This came up in the review queue and I spent some time thinking about it before selecting that reason. On the one hand, I like the humour and the reference to Fermat. On the other hand, it really doesn't help the questioner, nor anyone else likely to come to the site. So I decided in the end that it should have been a comment, not an answer. The reason that ends up on the question is slightly different to the one the review queue presents; I was expecting the "this is a really a comment part" to be more obvious. For what it's worth I haven't downvoted, but I see that others have.
My suggestion would be to convert it into a comment on the original question :)