To me a rhetorical question was always one with 2 possible answers, one of which was not a genuinely exercisable choice. e.g. "can we borrow your football, or would you like your head kicked in your four eyed twat?".
However, having done extensive research on the matter I see that "a rhetorical question is a question that you ask without expecting an answer. The question might be one that does not have an answer. It might also be one that has an obvious answer but you have asked the question to make a point, to persuade or for literary effect.". Additionally, there seems to be no rule excluding the questioner from answering their own question.
So, it looks like you win! Clearly, the question asked had an obvious answer, and was set forth for the literary effect of stating the bleeding obvious. Job done.