While it's certainly commendable to look for a good comment to leave, especially with regards to the experience of new users, it is not the case that such a comment always exists - and it is better to leave no comment at all than to leave a comment that delivers a negative judgement of a post without showing the path forward. As a corollary, if you believe a post to be unsalvageable, leaving a comment is not the correct response. While we should strive to leave constructive comments where we can think of them, sometimes the best outcome is to quietly close a question.
That particular question is one that I voted to close without commenting on. I assumed that the author posted it with the intention to amuse more than the intention to get an answer (although, of course, I can always be wrong about these things) - and, in any case, I could not make out the seed of a question in that post. If you read the post and came to a conclusion such as, "Oh, maybe this post is really trying to ask about X" or "This would be fine if the author just wrote it like Y instead," it would be very welcome to leave that as a comment - and it's certainly a good thing when people who downvote or close a question put some thought into how to leave a constructive comment (and the comment templates linked in this meta question are a reasonable source of inspiration for this). That said, sometimes that kind of comment just isn't out there, but we still ought to use closure as a tool.